crab apple

  1. any of several species of small, very sour apples (genus Malus), growing wild or cultivated and used for making jellies and preserves
  2. a tree bearing crab apples

See crab apple in American Heritage Dictionary 4

also crab·ap·ple

noun
  1. Any of several deciduous trees of the genus Malus, native to North America and Eurasia and having clusters of white, pink, or reddish flowers.
  2. The small tart fruit of such a tree, sometimes used to make jelly and preserves.

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