Definition of cavity in US English:


nounPlural cavities

  • 1An empty space within a solid object, in particular the human body.

    ‘the abdominal cavity’
    ‘a body cavity’
    • ‘It consisted of filling the empty space of cavities with hydrogen atoms and drawing the surface contour of the H atoms.’
    • ‘This cavity may then be filled with coal, calcite, siderite, or any other form of sediment.’
    • ‘Retention of water and fluid in the abdominal cavity gives rise to local distension.’
    • ‘These animals are thought to survive only if ice is confined to their body cavity and other extracellular spaces.’
    • ‘The effects of this fracture depend on its size and location within the orbital cavity.’
    • ‘A larger nozzle will periodically fill the wall cavity as the structure begins to rise.’
    • ‘Fill the cavities of the peaches with the mixture.’
    • ‘The infection can also spread into the abdominal cavity causing pain and inflammation around the liver.’
    • ‘Nests are built in natural cavities, usually within six feet of the ground.’
    • ‘Put each apple on a large piece of foil and fill the core cavities with the mincemeat mixture.’
    • ‘Sinuses are air-filled, hollow spaces or cavities within the facial bones surrounding your nose.’
    • ‘An arrowhead was discovered in the body cavity of another female skeleton, suggesting she died in battle.’
    • ‘Endoscopes - a camera device with a light attached - are usually used to look inside a body cavity or organ.’
    • ‘Mold flow analysis was used to ensure that the cavity would fill without problem.’
    • ‘This type is often used for empty wall cavities in existing buildings.’
    • ‘The walls are a feat of engineering, with short flights of stairs within the hollow cavity reaching higher galleries.’
    • ‘The size of the pump is restricted by available space in the abdominal cavity.’
    • ‘Many species of wildlife require openings or cavities in standing trees for nesting or shelter.’
    • ‘Some of the pages had been hollowed out, and hidden within the cavity lay a single gold ring, as plain and simple a piece of jewellery as the first.’
    • ‘Spawning takes place between December and March, with eggs being laid in rock cavities or empty bivalve shells in shallow water or even on the shore.’
    space, chamber, hollow, hole, pocket, pouch
    View synonyms
    1. 1.1 A decayed part of a tooth.
      • ‘Dentists, of course, are concerned about soft drinks and cavities, or caries.’
      • ‘Severe cases result in cavities and the need to pull all the front teeth until the permanent ones grow in.’
      • ‘Most parents ignore cavities in children's teeth, which is one major reason for many children being poor eaters.’
      • ‘Fluoride ions in low concentrations have been shown to prevent cavities in teeth.’
      • ‘Dental cavities have been filled with gold since ancient times.’
      • ‘Many common pathologies were observed including tooth cavities and osteoarthritis.’
      • ‘I can't say that the pop quiz was total murder, but I would rather get a cavity filled.’
      • ‘It was an intense experience to be sure, like getting your cavities filled at the dentist office.’
      • ‘It is for this reason that you should visit your dentist regularly as small cavities are much easier to treat than advanced decay.’
      • ‘Teeth develop cavities when they lose minerals such as calcium and phosphorus.’
      • ‘It's to detect cavities within your teeth and problems with your gums, tongue and mouth.’
      • ‘I know two mothers with toddlers who nurse several times a night and have extensive tooth decay and cavities.’
      • ‘This mixture, initially the texture of wet sand, is placed into the tooth cavity.’
      • ‘She shook her head and told him that two of her lower teeth had cavities.’
      • ‘If the teeth are not cleaned properly they may be vulnerable to tooth decay causing cavities, or to gum disease.’
      • ‘Oral diseases such as gum inflammation, cavities, tooth decay and other infections should be treated early.’
      • ‘He described techniques for scraping out caries and filling the cavities with soft metals such as tin, lead, or gold.’
      • ‘The dentist may put fluoride on your child's teeth to prevent cavities.’
      • ‘He said dentists do far more than fill cavities and polish teeth.’
      • ‘If you have not been to a dentist recently or are concerned your teeth may have cavities please advise your nurse or doctor.’


Mid 16th century: from French cavité or late Latin cavitas, from Latin cavus ‘hollow’.