Caducous
Pronunciation : Ca*du"cous
Etymology : [L. caducus falling, inclined to fall, fr. cadere to fall. See Cadence.] (Bot. & Zo?l.)
Definition : Defn: Dropping off or disappearing early, as the calyx of a poppy, or the gills of a tadpole.
Source : Webster's Unabridged Dictionary, 1913