any of a group of thorny shrubs and small trees (genus Crataegus) of the rose family, with white, pink, or red flowers and usually red fruits (haws) resembling miniature cherries
See hawthorn in American Heritage Dictionary 4
(hôˈthôrnˌ)
noun
Any of various usually thorny trees or shrubs of the genus Crataegus having clusters of white or pinkish flowers and reddish fruits containing a few one-seeded nutlets.