n. - A leaflet of a pinnate leaf. See Illust. of Bipinnate leaf,
under Bipinnate.
n. - One of the primary divisions of a decompound leaf.
n. - One of the divisions of a pinnate part or organ.
n. - Any species of Pinna, a genus of large bivalve mollusks
found in all warm seas. The byssus consists of a large number of long,
silky fibers, which have been used in manufacturing woven fabrics, as a
curiosity.