Definition of foam in English:



mass noun
  • 1A mass of small bubbles formed on or in liquid, typically by agitation or fermentation.

    ‘a beer with a thick head of foam’
    • ‘It's boiling over, and I rush over to sort it out, simultaneous covering the hob controls in sauce and washing up liquid foam.’
    • ‘Behind him, Tekan was quietly watching the water hit the side of the ship, before breaking into a multitude of bubbles and foam.’
    • ‘We look at how we can extend the shelf life of beer and at improving foam - people equate freshness with a nice head of foam.’
    • ‘Waves cracked against the hull as the bow pushed through the icy foam, sending spray up across the deck.’
    • ‘Boiling also agitates the water, increasing the amount of foam.’
    • ‘She poured a dollop into her hands and raked her fingers through her hair, lathering the shampoo into a thick white foam.’
    • ‘The molinillo was placed in the chocolate pot and agitated to form foam.’
    • ‘As a coffee shop, they offer all the extras you hope for, including lattes served in pre-warmed mugs decorated with thick drifts of creamy foam.’
    • ‘Without warning, a mass of foam boiled to the surface just off the port bow.’
    • ‘There is so much foam and fizz you can't see the water for all that froth.’
    • ‘The ragged line of white foam bubbled and surged before it's fading power was overtaken by the next wave.’
    • ‘I went back into the bathroom and found the tub filled with pink foam bubbles.’
    • ‘The waves sank in a general rush of foam, and for a moment the liquid was still.’
    • ‘She massaged her shampoo into her hair and scalp until it created a thick, rich foam.’
    • ‘In his sleep he was home under a coconut tree on the Savannah or at Maracas Beach feeling bubbles of foam curling up between his toes.’
    • ‘At the point where the waste water entered the brook, there is a thick layer of foam.’
    froth, spume, surf, spindrift, spray
    View synonyms
    1. 1.1 A mass of small bubbles formed from saliva or sweat.
      • ‘A small opening in the corner of his lips let some saliva foam through.’
      • ‘Bryce paused in his tooth brushing, bubbles of minty liquid foam dripping messily down his chin.’
      • ‘The salt bubbled and hissed in its mouth, building to a thick, white foam.’
      • ‘Their coats were dark with sweat, and streaked with white foam.’
      • ‘It growled low and deep, with foam bubbling from its mouth.’
      • ‘The gauchos of Argentina wore chaps that hardened from the foam and sweat of the horse's body, causing them to walk with flexed knees.’
      • ‘Snorts and harsh breaths from their mounts, not to mention the lather and foam built up, showed these two riders were headed somewhere, and fast.’
    2. 1.2 A liquid preparation containing many small bubbles.
      as modifier ‘shaving foam’
      • ‘DF200 can be deployed as a foam or liquid spray, with foam application being preferable in most instances.’
      • ‘Victims are sprayed with coloured foam and dragged off stage.’
      • ‘As the couple left the church with huge smiles across their faces they were greeted with showers of confetti and children blew foam bubbles.’
      • ‘She coughed and sputtered at the thick foam, and suddenly remembered something else.’
      • ‘Speaking of which, please turn in all your unopened MRE's that have bubbles or are covered in foam.’
      • ‘They spray foam on the fire, but even in this controlled situation, it's not easy to put out.’
      • ‘Rio skidded out of the kitchen, face covered in strange, thick white foam.’
      • ‘Doctor Mighty rolled over, grabbed one of the KryptoLites, and popped it open in a spray of foam.’
      • ‘He expelled a spray of fine white foam which almost extinguished the great log fire in the corner of the snug.’
      • ‘The liquid foam expands very slowly and thus reduces the chance of damaging the wall from over-expanding.’
      • ‘For these, Baki lined an old grain bin on the property with insulating spray foam and installed a propane heater unit.’
      • ‘Spray foam still has a share, and structural metal has gone beyond the metal building image to cover all types of structures.’
      • ‘They spread a thick layer of foam over the forecourt and the blazing vehicles and used water jets to cool gas cylinders in a nearby storage area.’
      • ‘Liquid foam is most often used in wall cavities or to seal air gaps in a home's envelope.’
      • ‘Instead of old-fashioned, high-dose liquid, doctors inject foam directly in to the swollen vein.’
      • ‘He said the foam had the consistency of shaving foam, but much smaller, and is entirely harmless.’
      • ‘You spray this foam on the handles of your current tools and then grip it as you would if using it in the garden.’
      • ‘But the cake, shaped like a Reese's cup with a liquid center and curry-touched foam, is pure yum.’
      • ‘‘I like the idea of putting in some of that exploding shaving foam so that when they opened up the capsule they would just get sprayed with foam,’ he said.’
      • ‘They make a decent café au lait that's served in a glass and topped with a thick, lip-sticking foam.’
    3. 1.3 A lightweight form of rubber or plastic made by solidifying liquid foam.
      as modifier ‘foam rubber’
      • ‘The pad is three inches thick, a third of which is closed-cell foam.’
      • ‘Utilizing two inch thick foam, you'll need to stack two pieces in the cavity to make up the necessary four inches of total thickness.’
      • ‘Kachel said cast members do wear special kneepads made of foam compressed to a quarter-inch inch thick so as not to show under their unitards.’
      • ‘Opening the box, the first thing you will see is the card itself wrapped in a thick static protection bag and placed in shaped white foam.’
      • ‘A piece of dry foam rubber or foam plastic, rubbed over the garment, will usually take them off.’
      • ‘Plastic, foam or rubber thongs are completely casual, but can be worn off the beach nonetheless.’
      • ‘Second, firm closed-cell foam inside the belt is better than squishy foam because it rebounds better over time.’
      • ‘It'd be a good idea to back the rubbers up with some foam.’
      • ‘Fambeau's new SafeShot bow case has thick eggshell foam.’
      • ‘Upon opening the tin, I found the walls of the tin neatly lined with thick foam, with an indentation for the mouse pad.’
      • ‘Thick foam, gel pads, and extra linen increase the distance between the patient and electrode and should not be used.’
      • ‘Hand-sand smaller or irregular areas with a rubber or foam sanding block.’
      • ‘Its molded plastic yoke, backed with thick foam padding, wraps around the shoulders and attaches to golf bags in one of two places.’
      • ‘Once the rubber and mounting foam have been cut, the stamps are glued to a wooden mound and are ready to impress!’
      • ‘The tank will no longer have thick foam insulation on the spot where it tore off Columbia at liftoff.’
      • ‘A very large piece of foam, the so-called PAL ramp foam, fell off the tank.’
      • ‘On top was a quarter-inch thick yellow urethane foam pad.’
      • ‘Imagine if you will, a tennis player's sweatband, slightly bigger and thicker, made of foam with a shiny cover.’
      • ‘Thick foam padding protects the guns and the tough nylon exterior makes for easy transportation.’
      • ‘Until the Columbia accident, the part was protected from ice buildup using thick sheets of foam.’
    4. 1.4the foamliterary The sea.
      ‘Venus rising from the foam’


  • Form or produce a mass of small bubbles; froth.

    ‘the sea foamed beneath them’
    ‘pints of foaming bitter’
    • ‘It has the insignia of Prydyn, the sea foaming around the sword, along with a heart.’
    • ‘The white-flecked ones, foaming as they crest, are the angrier-looking.’
    • ‘The tub is slick, and with lots of slippery bubbles foaming up from the jets, you'd best watch your step.’
    • ‘Squirt a little bit of washing up liquid into the cup, fill again with hot water so that the detergent foams.’
    • ‘It fizzed; it foamed; it had all the trappings of a real experiment.’
    • ‘She saw the boats pulling away from the docks and the water foamed and bubbled beneath them.’
    • ‘You spray it in a big gap, and it sort of foams up dramatically in order to fill said aperture.’
    • ‘A life that bubbled and foamed with excitement and humor.’
    • ‘Kneer said he looked out of his window Friday morning to see suds foaming over the bank.’
    • ‘However, as the water hit them, they emitted a terrible high-pitched screech and began to bubble, foam, and disintegrate on the spot.’
    • ‘He's on his way out, and, rabid dog that he is, it's no great surprise he's going out foaming all the way.’
    • ‘Stir and set aside for 5 or 6 minutes, until mixture bubbles and foams.’
    • ‘Add the olive oil to the pan and, when you can feel a good heat rising, slip in the butter and swirl it in the pan as it foams and melts.’
    • ‘He had never seen anything like it, this barrier of blue and white that boiled and roared and foamed before him, like a thing alive.’
    • ‘I wasn't thrashing and foaming and squawking like the others.’
    • ‘And now the Thames, like the Tiber, is foaming with much blood.’
    • ‘An elderly man rolled up his trousers and paddled in the sea, chuckling as the water foamed and tickled at his ankles.’
    • ‘Rain foamed on the hotel's harbour side lawn and produced a bank of hanging mist opaque as hill fog.’
    • ‘He foamed and fulminated, raging against Temby and his excesses.’
    • ‘The mean person foams in the mouth, lolls around for 5 seconds, and passes out.’
    froth, froth up, cream, bubble, fizz, effervesce, spume, lather, ferment, rise, boil, seethe, simmer
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  • foam at the mouth

    • informal Be very angry.

      • ‘Ed Harris is angry and foaming at the mouth as Moss, a man who seems to be traveling down the same road as Shelley.’
      • ‘He plays like a rabid dog, always foaming at the mouth.’
      • ‘‘Alex was foaming at the mouth - he had lost it completely - and he frightened a lot of people that night,’ recalled Yates.’
      • ‘I don't know about you, but I'm foaming at the mouth and ready to throw down.’
      • ‘That's why their foaming at the mouth over a tasteless stand-up act is pure demagoguery.’
      • ‘Bianca was beside herself, still cuffed, doing everything but foaming at the mouth.’
      • ‘Meanwhile, back at the ranch, the academy foams at the mouth.’
      • ‘This is a member of a family that foams at the mouth against school vouchers and school testing.’
      • ‘Anyway, this is supposed to get us all foaming at the mouth with indignation but quite frankly this law doesn't make any sense.’
      • ‘But you'd also have Dobinson, a 44-year-old, foaming at the mouth.’
      irate, annoyed, cross, vexed, irritated, exasperated, indignant, aggrieved, irked, piqued, displeased, provoked, galled, resentful
      View synonyms


Old English fām (noun), fǣman (verb), of West Germanic origin; related to Old High German feim (noun), feimen (verb).