Etymology
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cavity (n.)

"a hollow place, empty space in the body," 1540s, from French cavité (13c.), from Late Latin cavitatem (nominative cavitas) "hollowness," from Latin cavus "hollow" (from PIE root *keue- "to swell," also "vault, hole").

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cavitation (n.)

"formation of bubbles in fluid," 1895, from cavity + -ation. Earlier as a medical term, "formation of cavities in the body" (1868).

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cavitate (v.)

"to form cavities or bubbles (in a fluid)," 1892 (implied in cavitated), back-formation from cavitation or else formed from cavity + -ate (2) . Related: Cavitating.

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*keue- 
*keuə-, Proto-Indo-European root meaning "to swell," also "vault, hole."

It forms all or part of: accumulate; accumulation; cave; cavern; cavity; coeliac; church; codeine; coelacanth; coeliac; coelomate; concave; cumulate; cumulative; cumulus; enceinte; excavate; kirk; kymatology; Kyrie eleison.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit svayati "swells up, is strong;" Greek kyein "to swell," koilos "hollow, hollowed out, spacious, deep;" Latin cumulus "a heap, pile, mass, surplus;" Lithuanian šaunas "firm, solid, fit, capable;" Middle Irish cua "hollow;" Armenian soyl "cavity."
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coelomate (adj.)

"having a body cavity distinct from the intestinal cavity," 1883, from Coelomata (1877), from Modern Latin neuter plural of coelomatus, from Greek koilomat- "hollow, cavity," from koilos "hollow, hollowed out, spacious, deep," from PIE root *keue- "to swell," also "vault, hole."

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vug (n.)
1818, from Cornish vooga "a cavity in rock; cave, hollow."
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coeliac (adj.)

"pertaining to the cavity of the abdomen," 1660s, from Latin coeliacus, from Greek koiliakos "pertaining to the bowels," also "pain in the bowels," from koilia "bowels, abdominal cavity, intestines, tripe" from koilos "hollow," from PIE root *keue- "to swell," also "vault, hole."

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intra-peritoneal (adj.)

also intraperitoneal, "within the cavity of the peritoeum," 1835, from intra- "within" + peritoneal (see peritoneum).

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hollow (n.)
"lowland, valley, basin," 1550s, probably a modern formation from hollow (adj.), which is from Old English holh (n.) "cave, den; internal cavity."
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pneumothorax (n.)

"presence of air in the pleural cavity," 1821, from French pneumothorax (1803), coined by French physician Jean Marc Gaspard Itard (1774-1838) from Greek pneumon "lung" (see pneumo-) + thorax.

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