Definitions for: Caducous

[adj] (biology) shed at an early stage of development; "most amphibians have caducous gills"; "the caducous calyx of a poppy"

Webster (1913) Definition: Ca*du"cous, [L. caducus falling, inclined to fall,
fr. cadere to fall. See Cadence.] (Bot. & Zo["o]l.)
Dropping off or disappearing early, as the calyx of a poppy,
or the gills of a tadpole.

Synonyms: deciduous, shed

Antonyms: lasting, persistent