Definition of bulb in English:

bulb

noun

  • 1A rounded underground storage organ present in some plants, notably those of the lily family, consisting of a short stem surrounded by fleshy scale leaves or leaf bases, lying dormant over winter.

    Compare with corm, rhizome
    • ‘It is a good time to buy and plant conifers and evergreens, summer-flowering bulbs and dahlia tubers.’
    • ‘Diet varies with the season but consists primarily of seeds, bulbs, leaves, berries, and some insects.’
    • ‘Glutamyl peptidase activity has been detected in leaves, roots, and bulbs of growing onions, but not in dormant bulbs of variety Southport White Globe.’
    • ‘Not far from West Bank Park, local residents planted daffodil bulbs in the green surround of Holgate Windmill last year.’
    • ‘Snowdrops hate having their roots disturbed, but dividing them in spring allows their roots to recover and gives the leaves time to feed the bulb before they become dormant later in summer.’
    • ‘Voles have been known to travel tunnels developed by moles to gain access to flower bulbs and other plant roots.’
    • ‘No matter what your climate, be sure to water planted bulbs throughout the winter.’
    • ‘When sold and planted in fall, bulbs are in a dormant state that makes them very easy to handle and ship.’
    • ‘Treating lily bulbs with cytokinin hormones can mean early flowers and more of them.’
    • ‘Those who received potted lilies can plant the bulbs outside in an area with bright light or in morning sun and afternoon shade.’
    • ‘On the left, a bulb of Fritillaria; bulbs are underground fleshy storage leaves wrapped tightly around the stem, such as in onion and garlic.’
    • ‘In the chilled bulb, the floral stem is visible in the centre of the bulb, while the leaves and flower have grown outside the sensitive volume of the detection coil.’
    • ‘A wide range of monocots produce bulbs of modified leaves which store food over the winter.’
    • ‘Checks with Norfolk police revealed that the pair were known to have been involved in the theft of wild flowers, plants and bulbs, which were then re-sold to the public.’
    • ‘Although they have their favourite plants, they will eat almost anything that's not too tough and leathery including leaves, stems, bulbs, root vegetables, even flowers.’
    • ‘The buds are already dormant within the bulbs and the difference in size will affect the size of the flower.’
    • ‘After 12 weeks of storage three of these bulbs were planted to determine the quality of the flowers.’
    • ‘Many of their early wildflowers and spring-blooming bulbs go dormant by Memorial Day, so they shrug off the dry summers.’
    • ‘If the winters are harsh, then cover the bulbs with straw or leaves.’
    • ‘The fresh weight of roots, bulbs and leaf bases (when the bulbing ratio was < 2) was measured every week or every month.’
    tuber, corm, rhizome
    View synonyms
  • 2

    short for light bulb
  • 3An expanded part of a glass tube such as that forming the reservoir of a thermometer.

    • ‘The grains of sand teeter on the edge of the glass bulb.’
    • ‘Another gadget, a simple glass bulb with four small vanes inside, the faces of each painted black or white.’
    • ‘It was a narrow glass tube with a bulb at the bottom.’
    • ‘Yesterday, all the bulbs in my galileo thermometer were up the top.’
    • ‘The instrument, consists of two glass bulbs united by a narrow neck.’
    • ‘Crookes's tube consisted of a glass bulb, from which most of the air had been removed, encasing two metal plates called electrodes.’
    • ‘They consisted of a curved U-tube filled with mercury attached to a bulb containing creosote.’
    • ‘A wet bulb thermometer is simply a thermometer with the bulb wrapped in moist muslin.’
    • ‘The result is an hourglass shaped vessel, with both the upper and lower bulbs holding 2 oz.’
    • ‘A glass bulb, then, is used to keep oxygen away from the filament.’
    1. 3.1 A hollow flexible container with an opening through which the air can be expelled by squeezing, such as that used to fill a syringe.
      • ‘The scrub person drapes the infant warmer with sterile terry cloth towels and ensures that there are two bulb syringes and cord clamps in the warmer.’
      • ‘Air cast pressure was changed by manually increasing air volume with a BP bulb; pressure was continuously monitored with a mercury manometer.’
      • ‘Gently put the compressed bulb into the open nostril.’
      • ‘Labels that do not adhere adequately to the bulb syringe could increase the risks of leaving foreign bodies in the surgical wound.’
      • ‘Nicola took out a small medicine bottle with a bulb syringe, and began with delicate squeezes of the bulb to collect the moisture that gathered at the corners of the child's eyes.’
      • ‘If your baby is having trouble sucking, try using a rubber suction bulb to help clear his or her nose before each feeding.’
      • ‘You would get less mercury in the dropper than you would water if you squeezed the bulb equally in both cases.’
      • ‘Blow out the dust with compressed air, canned air, a blow-out bulb (ear syringe), or a vacuum in the blower mode.’
      • ‘Use a suction bulb or put some of the warm salt water in the cup of your hand to sniff it up one nostril at a time.’
      • ‘The infant developed mild respiratory distress at delivery that resolved with bulb and orogastric suction and administration of free-flow oxygen.’
      • ‘A bulb syringe to be used to remove mucous from the mouth/nose’
      • ‘Release pressure (let the air back in) on the bulb until the nose is clear.’
      • ‘The third time I arranged things just so, manoeuvred the syringe into my ear, reaching over the top of my head with my left hand, and squeezed the tiny rubber bulb gently.’
      • ‘Dry the syringe bulb and store it in a cup or container.’
      • ‘Release the bulb, holding it in place while it suctions the mucus from your baby's nose.’
      • ‘Empty the contents onto a tissue by squeezing the bulb rapidly while holding it upside down.’
      • ‘Gently suction out the nose with an ear bulb every few hours.’
      • ‘Multiple delivery methods and devices have been studied but not compared, including bottles or pots, bulb syringes, inhalers, and nebulizers.’
      • ‘Using a bulb syringe and saline nose drops can also help to keep a baby's nose clear.’
      • ‘Droppers with rubber bulbs should not be kept with the essential oil bottle as the highly concentrated oil can turn the rubber bulb into gum.’
    2. 3.2 A spheroidal dilated part at the end of an anatomical structure.
      • ‘The middle-right arrow shows tissue similar to the uterus and ejaculatory bulb cortex.’
      • ‘When light reaches your hair follicles, it temporarily generates enough heat to destroy the follicles and bulbs.’
      • ‘For the sense of smell, odors are processed in an area of the brain called the olfactory bulb.’
      • ‘The offactory bulb in the nose and the pleasure center of the brain are connected by a direct sensory pathway.’
      • ‘Glomus tumor is a vascular neoplasm arising from the paraganglia around the carotid bifurcation, the jugular bulb, or the tympanic arteries.’
      • ‘An upper gastrointestinal tract endoscopy showed mucosal telangiectasia in the stomach and duodenal bulb.’
      • ‘A skin biopsy from one of the patches found many empty hair bulbs without any inflammation or scarring.’
      • ‘The lower esophagus and duodenal bulb are common sites of gastric metaplasias occurring as a protective response to the injurious action of gastric acid.’
      • ‘These neuroendocrine tumors arise from the adventitia of the jugular bulb or the neural plexus within the middle ear space.’
      • ‘He observed long processes of sensory neurons coursing into the brain from the retina and olfactory bulb.’
      • ‘Muscular sphincters may exist anteriorly or posteriorly in the pharyngeal bulb.’
      • ‘An anomalous carotid artery or jugular bulb may present in a similar fashion.’
      • ‘Venous hums may be heard in patients with hypertension or abnormally high placement of the jugular bulb.’
      • ‘An additional set of 10, usually monociliary gland cells opens anteriorly and outside of the pharyngeal bulb into the mouth cone lumen.’
      • ‘Everything from the beginning of the esophagus to the posterior of the anterior bulb was considered ‘foregut.’’
      • ‘If it is exactly in the midline, it may be the duodenal bulb, the pylorus, or the distal antrum.’
      • ‘We report a case of Brunner gland hamartoma of the duodenal bulb with unusual histologic features.’
      • ‘Loss of gar - 3 function speeds up the repolarization of the terminal bulb muscles and shortens action potentials.’
      • ‘Loss of gar - 3 function results in shortened action potentials and brief muscle contractions in the pharyngeal terminal bulb.’
      • ‘Similar tumors may arise from neighboring areas, including the jugular bulb, the middle ear, and the mastoid portion of the temporal bone.’

Origin

Late Middle English: via Latin from Greek bolbos onion, bulbous root.

Pronunciation

bulb

/bʌlb/