of bass-an edible, spiny-finned fish, esp. of the genera roccus, labrax, and related genera. there are many species.-the two american fresh-water species of black bass (genus micropterus). see black bass.-species of serranus, the sea bass and rock bass. see sea bass.-the southern, red, or channel bass (sciaena ocellata). see redfish.-the linden or lime tree, sometimes wrongly called whitewood; also, its bark, which is used for making mats. see bast.-a hassock or thick mat.-a bass, or deep, sound or tone.-the lowest part in a musical composition.-one who sings, or the instrument which plays, bass.-deep or grave in tone.-to sound in a deep tone.