n. 1 (in full bay laurel) a laurel, Laurus nobilis, having deep green leaves and purple berries. Also called SWEET BAY. 2 (in pl.) a wreath made of bay-leaves, for a victor or poet. bay-leaf the aromatic (usu. dried) leaf of the bay-tree, used in cooking. bay rum a perfume, esp. for the hair, distilled orig. from bayberry leaves in rum.
[ OF baie f. L baca berry ]