Describing a part that falls off, or is shed, at a particular time or stage of development.
In the Hippoidea there is generally the full series of 44 teeth, but the first premolar is often deciduous or wanting in the lower or in both jaws.
Transitory, ephemeral, not lasting.
From Latin dēciduus (“falling down or off”), from dēcidō (“to fall down”).
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