cranberry

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. A mat-forming, evergreen shrub (Vaccinium macrocarpum) of eastern North America, having pink flowers and tart, red, edible berries.
2. n. The berries of this plant, used in sauces, jellies, relishes, and beverages.
3. n. Any of several similar or related plants, especially Vaccinium oxycoccos.

Century Dictionary and Cyclopedia

1. n. The fruit of several species of Vaccinium. In Europe it is the fruit of V. Oxycoccus, also called bogwort, mossberry, or moorberry, as it grows only in peat-bogs or swampy land, usually among masses of sphagnum. The berry, when ripe, is globose and dark-red, and a little more than a quarter of an inch in diameter. The berries form a sauce of fine flavor, and are much used for tarts. The same species is called in the United States the small cranberry, in distinction from the much larger fruit of the V. macrocarpon, which is extensively cultivated and gathered in large quantities for the market. The cowberry. V. Vitis-Idæa, is sometimes called the mountain-cranberry.
2. n. The plant which bears this fruit.

Wiktionary

1. n. A shrub belonging to the subgenus oxycoccus of the genus Vaccinium, consisting of four species.
2. n. The red berry of that shrub.

GNU Webster's 1913

1. n. (Bot.) A red, acid berry, much used for making sauce, etc.; also, the plant producing it (several species of Vaccinum or Oxycoccus.) The high cranberry or cranberry tree is a species of Viburnum (Viburnum Opulus), and the other is sometimes called low cranberry or marsh cranberry to distinguish it.

WordNet 3.0

1. n. very tart red berry used for sauce or juice
2. n. any of numerous shrubs of genus Vaccinium bearing cranberries