D defs.my
Entry 2 senses Webster, 1913

Cavity

/kăv'-ət-ē/ · Cav·i·ty · IPA /[ˈkʰæv.ɨɾ.i]/
01 n. Hollowness.
pl. Cavities ((#))
  1. 1.
    Hollowness.[Obs.]
    “The cavity or hollowness of the place.” — Goodwin.
  2. 2.
    A hollow place; a hollow; as, the abdominal cavity.
    “An instrument with a small cavity, like a small spoon.” Arbuthnot.
    “Abnormal spaces or excavations are frequently formed in the lungs, which are designated cavities or vomicæ.” — Quain.
Phrases & compounds
Body cavity — the cœlum. See under Body.