cavity

n. hole, empty space; caries, tooth decay (Pathology)

A cavity is a hole. It may refer to:Dental cavity, damage to the structure of teethResonator, a device designed to select for waves of particular wavelengthsOptical cavity, the cavity resonator of a laserCavitation, the phenomenon of partial vacuums forming in fluid, for example, in propellorsCavitary pneumonia, a type of pneumonia in which a hole is formed in the lung
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Cavity /cav·i·ty/ 1. a hollow place or space, or a potential space, within the body or one of its organs. 2. [more]Cavity - Community and Resources

Noun
1. a sizeable hole (usually in the ground); "they dug a pit to bury the body"
(synonym) pit
(hypernym) hole, hollow
(hyponym) barbecue pit
2. space that is surrounded by something
(synonym) enclosed space
(hypernym) space
(hyponym) hollow
3. soft decayed area in a tooth; progressive decay can lead to the death of a tooth
(synonym) caries, dental caries, tooth decay
(hypernym) decay
4. (anatomy) a natural hollow or sinus within the body
(synonym) bodily cavity, cavum
(hypernym) structure, anatomical structure, complex body part, bodily structure, body structure
(hyponym) blastocoel, blastocoele, blastocele, segmentation cavity, cleavage cavity
(part-holonym) body, organic structure, physical structure
(classification) anatomy, general anatomy

(n.)
Hollowness.
  

(n.)
A hollow place; a hollow; as, the abdominal cavity.