Entry 2 senses Webster, 1913 Petal /(pĕt"al; 277)/ · Pet·al · IPA /ˈpɛtl̩/ 01 n. One of the leaves of the corolla, or the colored leaves of a flower. See Corolla, and Illust. of Flower. 1. One of the leaves of the corolla, or the colored leaves of a flower. See Corolla, and Illust. of Flower.(Bot.) See: Corolla, Flower 2. One of the expanded ambulacra which form a rosette on the black of certain Echini.(Zool.)