Webster's English Dictionary

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deciduous

de.cid.u.ous \di-'sij-*-w*s\ aj [L deciduus, fr. decidere to fall off, fr. 
   de- + cadere] to fall 1: falling off (as at the end of a growing period or 
   stage of development)  2: having deciduous parts  3: EPHEMERAL  - 
   de.cid.u.ous.ly av