[de.cid.u.ous] adj [L deciduus, fr. decidere to fall off, fr. de- + cadere to fall--more at chance] (1688) 1: falling off or shed seasonally or at a certain stage of development in the life cycle "~ leaves" "~ teeth"
2. a: having deciduous parts "~ trees" b: having the dominant plants deciduous "a ~ forest"
3: ephemeral -- de.cid.u.ous.ness n