foxtail grass n 1: ground pine thickly covered with bristly leaves; widely distributed in barren sandy or peaty moist coastal regions of eastern and southeastern United States [syn: {foxtail grass}, {Lycopodium alopecuroides}] 2: grasses of the genera Alopecurus and Setaria having dense silky or bristly brushlike flowering spikes [syn: {foxtail}, {foxtail grass}]