- a tropical or subtropical cultivated evergreen rutaceous tree, Citrus paradisi
- the large round edible fruit of this tree, which has yellow rind and juicy slightly bitter pulp
WordReference Random House Learner's Dictionary of American English © 2014
- a large, roundish, yellow-skinned citrus fruit that has a juicy, acid inside that may be eaten: [countable]Grapefruits were plentiful.[uncountable]Grapefruit is high in vitamin C.
- [countable] the tropical or semitropical tree yielding this fruit.