Lig″ule (–ū̍l), n. [L. ligula, lingula, little tongue, dim. of lingua tongue: cf. F. ligule.]
1. (Bot.) (a) The thin and scarious projection from the upper end of the sheath of a leaf of grass. (b) A strap-shaped corolla of flowers of Compositæ.
2. (Anat.) A band of white matter in the wall of fourth ventricle of the brain.