1. crab apple, crabapple, cultivated crab apple, apple tree
usage: any of numerous varieties of crab apples cultivated for their small acidic (usually bright red) fruit used for preserves or as ornamentals for their blossoms
2. wild apple, crab apple, crabapple, apple tree
usage: any of numerous wild apple trees usually with small acidic fruit
3. crab apple, crabapple, apple
usage: small sour apple; suitable for preserving; "crabapples make a tangy jelly"