1. In common usage, herbage; the plants which constitute the food of cattle and other beasts.

2. In botany, a plant having simple leaves, a stem generally jointed and tubular, a husky calyx, called glume, and the seed single. This definition includes wheat, rye, oats, barley, etc., and excludes clover and some other plants which are commonly called by the name of grass. The grasses form a numerous family of plants.

Grass of Parnassus, a plant, the Parnassia.