Definition of grapefruit noun from the Oxford Advanced American Dictionary

 

grapefruit

 noun
noun
NAmE//ˈɡreɪpfrut//
 
(pl. grapefruit or grapefruits)[countable, uncountable]
 
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a large, round, yellow citrus fruit with a lot of slightly sour juice
See the Oxford Advanced Learner's Dictionary entry: grapefruit