n. In botany, a leaf in a flower-cluster or subtending a flower, usually differing somewhat from an ordinary leaf in size, form, or texture, often much reduced, and sometimes petaloid, highly colored, and very conspicuous.n. In zoology, a part of a hydrozoan likened to a bract of a plant; a hydrophyllium. See cuts under Athorybia and hydrophyllium.n. A thin plate of metal used as an ornament, as, for example, one of the gold disk-like ornaments made in Scandinavian countries in the Viking age.n. The oval distal exite on the appendages of certain segments of phyllopod crustaceans, as Apus, probably serving a respiratory function.