1. Not permanent; denoting that which eventually falls off. 2. (D) (in dental formulas)In dentistry, often used to designate the first or primary dentition. See d. tooth. [L. deciduus, falling off]
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de·cid·u·ous di-'sij-ə-wəs adj
1) falling off or shed at a certain stage in the life cycle
2) having deciduous parts <a \deciduous dentition>
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de·cid·u·ous (də-sidґu-əs) [L. deciduus, from decidere to fall off] falling off or shed at maturity, as the teeth of the first dentition.Medical dictionary. 2011.