a tree that produces fruit like small hard apples with a bitter sharp taste, also called crab apples 酸苹果树；花红树；沙果树 crab-apple jelly 海棠果冻
Word Originlate Middle English: crab perhaps an alteration (influenced by crab or crabbed) of Scots and northern English scrab, in the same sense, probably of Scandinavian origin.