bay rum

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. An aromatic liquid originally prepared by distilling the leaves of the bay rum tree in rum and water but now usually made by mixing the oil from those leaves with other solvents.

Century Dictionary and Cyclopedia

1. n. A fragrant spirit much used as a cosmetic, etc., especially by barbers, obtained by distilling the leaves of the Pimenta acris (see bayberry, 3), of the natural order Myrtaceæ, with rum, or by mixing the volatile oil procured from the leaves by distillation with alcohol, water, and acetic ether. It is the spiritus myrciœ of the United States Fharmacopœia.

Wiktionary

1. n. A fragrant liquid used for cosmetic and medicinal purposes.

GNU Webster's 1913

1. A fragrant liquid, used for cosmetic and medicinal purposes.

WordNet 3.0

1. n. an aromatic liquid originally obtained by distilling the leaves of the bayberry tree with rum