deciduous

adj. of passing interest; temporary and shed after period of time (of leaves, baby teeth, etc.)

Deciduous means "temporary" or "tending to fall off" (deriving from the Latin word , to fall off) and is typically used in reference to trees or shrubs that lose their leaves seasonally. In a more specific sense deciduous means the dropping of a part that is no longer needed, or falling away after its use is finished. In plants it is the result of natural processes, in other fields the word has similar meaning, including deciduous antlers in deer or deciduous teeth in some mammals including human children.
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Adjective
1. (of plants and shrubs) shedding foliage at the end of the growing season
(antonym) evergreen
(similar) broadleaf, broad-leafed, broad-leaved
(classification) plant, flora, plant life
2. (of teeth, antlers, etc.) being shed at the end of a period of growth; "deciduous teeth"
(similar) caducous, shed

(a.)
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.
  

Synonyms and related words:
arborary, arboreal, arboreous, arborescent, arboresque, arborical, arboriform, brittle, bushlike, bushy, capricious, changeable, citrous, collapsing, coniferous, corruptible, declining, declivitous, decurrent, dendriform, dendritic, dendroid, descendant, descending, down, down-reaching, downcoming, downfalling, downgoing, downhill, downsinking, downward, drooping, dropping, dying, ephemeral, evanescent, evergreen, fading, falling, fickle, fleeting, flitting, fly-by-night, flying, fragile, frail, fugacious, fugitive, half-hardy, hardwood, hardy, impermanent, impetuous, impulsive, inconstant, insubstantial, momentary, mortal, mutable, nondeciduous, nondurable, nonpermanent, on the descendant, on the downgrade, passing, perennial, perishable, piny, plummeting, plunging, sagging, scrubbly, scrubby, scrublike, setting, short-lived, shrubby, shrublike, sinking, softwood, submerging, subsiding, temporal, temporary, tottering, transient, transitive, transitory, treelike, tumbledown, undurable, unenduring, unstable, volatile