\Lig"ule\ (-[-u]l), 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 Composit[ae].
2. (Anat.) A band of white matter in the wall of fourth
   ventricle of the brain.