Co*rol"la (k?-r?l"l?), n. [L. corolla a little crown or garland, dim. of corona. See Crown.] (Bot.) The inner envelope of a flower; the part which surrounds the organs of fructification, consisting of one or more leaves, called petals. It is usually distinguished from the calyx by the fineness of its texture and the gayness of its colors. See the Note under Blossom.

• (botany) Collective term for the petals of a flower, i.e. the outermost but one whorl of flower parts, when this is not the same in appearance as the outermost whorl (the calyx).