Petal (?), n. [Gr. &unr_; a leaf, a leaf or plate of metal, fr. &unr_; outspread, broad, flat: cf. F. pétale. See Fathom.] 1. (Bot.) One of the leaves of the corolla, or the colored leaves of a flower. See Corolla, and Illust. of Flower.
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2. (Zoöl.) One of the expanded ambulacra which form a rosette on the black of certain Echini.
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