sweet basil n 1: annual or perennial of tropical Asia having spikes of small white flowers and aromatic leaves; one of the most important culinary herbs; used in salads, casseroles, sauces and some liqueurs [syn: {common basil}, {sweet basil}, {Ocimum basilicum}] 2: leaves of the common basil; used fresh or dried [syn: {basil}, {sweet basil}]