Deciduous

means

  1. (of trees and shrubs) shedding all leaves annually at the end of the growing season and then having a dormant period without leaves
  2. (of antlers, wings, teeth, etc) being shed at the end of a period of growth
  3. (rare) impermanent; transitory

 

The word has been derived from Latin dēciduus falling off, from dēcidere to fall down, from cadere to fall.

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