Generally, the term deciduous means “the dropping of a part that is no longer needed” and the “falling away [of a part] after its purpose is finished”. In plants, it is the result of natural processes. “Deciduous” has a similar meaning when referring to animal parts, such as deciduous antlers in deer,[3]deciduous teeth (baby teeth) in some mammals (including humans); or decidua, the uterine lining that sheds off after birth.

-Wikipedia

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