1) An apparently hollow formation in the structure of an astronomical
object, for example a sizable hole on the surface of a
→ molecular cloud created by
→ ultraviolet photons of a
→ massive star.
From M.Fr. cavité, from L.L. cavitas "hollowness," from L. cavus "hollow."
Kâvâk, related to verb kâvidan (kâftan) "to dig; to examine, investigate," cf. L. cavus "hollow" (E. derivatives: cavity, concave, cave, excavate), Gk. koilos "hollow," Armenian sor, PIE *kowos "hollow."
kâvâk-e bini, ~ damâq
Fr.: cavité nasale