petal

n. leave of the corolla of a flower, flower petal

For the petals of chakras, see Petal (chakra). A petal (from Ancient Greek petalon "leaf", "thin plate"), regarded as a highly modified leaf, is one member or part of the corolla of a flower. The corolla is the name for all of the petals of a flower; the inner perianth whorl, term used when this is not the same in appearance (color, shape) as the outermost whorl (the calyx) and is used to attract pollinators based on its bright color. It is the inner part of the perianth that comprises the sterile parts of a flower and consists of inner and outer tepals. These tepals are usually differentiated into petals and sepals. The term "tepal" is usually applied when the petals and sepals are similar in shape and color. In a "typical" flower the petals are showy and colored and surround the reproductive parts. The number of petals in a flower (see merosity) is indicative of the plant's classification: eudicots (the largest group of dicots) having typically four or five petals and monocots and magnoliids having three, or some multiple of three, petals.
See more at Wikipedia.org...

Noun
1. part of the perianth that is usually brightly colored
(synonym) flower petal
(hypernym) floral leaf
(part-holonym) corolla

(n.)
One of the leaves of the corolla, or the colored leaves of a flower. See Corolla, and Illust. of Flower.
  

(n.)
One of the expanded ambulacra which form a rosette on the black of certain Echini.
  

petal