n. The flattened and spade-like fore tarsus of certain insects, usually employed for swimming.n. One of the nodules or ossicles in the mouth-parts of some starfishes, as brittle-stars, borne upon the torus angularis, moved by proper muscles, and collectively serving as teeth. More fully called pala angularis.n. The conessi-bark (which see, under bark).n. Same as palayn. A thin layer of brain tissue, fancifully compared to the shape of a spade, at the extremity of the rima, which connects the cerebrum and the fimbriƦ.n. A Hawaiian name for syphilis.n. An abbreviated form of impala.