Etymology
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caducous (adj.)

"having a tendency to fall or decay," 1797, in botany, from Latin caducus "falling, fallen, fleeting," from cadere "to fall, decline, perish," from PIE root *kad- "to fall." Related: Caducity.

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Definitions of caducous

caducous (adj.)
shed at an early stage of development;
most amphibians have caducous gills
the caducous calyx of a poppy
Synonyms: shed
From wordnet.princeton.edu