deciduous

(de-sid'u-us) [L. decidere, to fall down.] That which eventually falls off, not permanent. d. dent i'tion, the first, temporary, dentition, d. mem'brane, decidua. d. plant, one the leaves, petals, etc., of which fall oflE the same season or year in which they are formed, d. teeth, milk teeth, teeth of the first dentition.