Real Dictionary

cranberry
Cranberries are red berries with a sour taste. They are often used to make a sauce or jelly that you eat with meat.

cranberry in American English
a firm, sour, edible, red berry, the fruit of any of several trailing evergreen shrubs (genus Vaccinium) of the heath family
noun: the red, acid fruit or berry of certain plants of the genus Vaccinium, of the heath family, as V. macrocarpon (large cranberry or American cranberry) or V. oxycoccus (small cranberry or European cranberry), used in making sauce, relish, jelly, or juice

cranberry in British English
noun: any of several trailing ericaceous shrubs of the genus Vaccinium, such as the European V. oxycoccus, that bear sour edible red berries