Falling off, or subject to fall or be shed, at a certain season, or a certain stage or interval of growth, as leaves (except of evergreens) in autumn, or as parts of animals, such as hair, teeth, antlers, etc.; also, shedding leaves or parts at certain seasons, stages, or intervals; as, deciduous trees; the deciduous membrane.
- Falling off or shed at a specific season or stage of growth: deciduous antlers; deciduous leaves; deciduous teeth.
- Shedding or losing foliage at the end of the growing season: deciduous trees.
- Not lasting; ephemeral.