- External part of the ear - A leaflet of a pinnate leaf. See Illust. of Bipinnate leaf,
under Bipinnate. - One of the primary divisions of a decompound leaf. - One of the divisions of a pinnate part or organ. - 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. - The auricle of the ear. See Ear.