Real Dictionary

Myrtle in American English
a feminine name
any of a genus (Myrtus) of plants of the myrtle family, with evergreen leaves, white or pinkish flowers, and dark, fragrant berries
designating a family (Myrtaceae, order Myrtales) of dicotyledonous, evergreen trees and shrubs, including eucalyptus, guava, clove, and blue gum
noun: a female given name
noun: any plant of the genus Myrtus, esp. M. communis, a shrub of southern Europe having evergreen leaves, fragrant white flowers, and aromatic berries: anciently held sacred to Venus and used as an emblem of love

myrtle in British English
noun: any evergreen shrub or tree of the myrtaceous genus Myrtus, esp M. communis, a S European shrub with pink or white flowers and aromatic blue-black berries