an aromatic liquid, used in medicines and cosmetics, originally obtained by distilling the leaves of the bayberry tree (Pimenta racemosa) with rum: now also synthesized from alcohol, water, and various oils
2. bay rum tree
bay rum in American English
1.
bayberry (sense 2)
2.
an aromatic liquid formerly obtained from leaves of the bayberry tree, now made of certain oils, water, and alcohol:it is used in medicines and cosmetics