• WordNet 3.6
    • n cowberry tart red berries similar to American cranberries but smaller
    • n cowberry low evergreen shrub of high north temperate regions of Europe and Asia and America bearing red edible berries
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Webster's Revised Unabridged Dictionary
    • n Cowberry (Bot) A species of Vaccinium Vaccinium Vitis-id├Ža), which bears acid red berries which are sometimes used in cookery; -- locally called mountain cranberry.
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Century Dictionary and Cyclopedia
    • n cowberry A name of the plant Vaccinium Vitis-Idæa or red huckleberry. See Vaccinium.
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In literature:

V. VITIS-IDEA (Cowberry, Flowering Box, or Brawlins) a native species, has racemose flowers, and red berries.
"Hardy Ornamental Flowering Trees and Shrubs" by A. D. Webster