Real Dictionary

bayberry in American English
any of a genus (Myrica) of shrubs of the bayberry family, as the wax myrtle, having a small, berrylike fruit covered with a wax used in making candles
designating a family (Myricaceae) of aromatic, dicotyledonous trees and shrubs (order Myricales)
noun: any of several often aromatic trees or shrubs of the genus Myrica, as M. pensylvanica, of northeastern North America, and M. californica, of the western U.S.

bayberry in British English
noun: any of several North American aromatic shrubs or small trees of the genus Myrica, that bear grey waxy berries: family Myricaceae