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Definition of lemon
1a yellow, oval citrus fruit with thick skin and fragrant, acidic juice. a drink made from or flavored with lemon juice:a port and lemon [as modifier]:lemon tea 2 (also lemon tree) the evergreen citrus tree that produces the lemon, widely cultivated in warm climates.
- Citrus limon, family Rutaceae
3a pale yellow color: [as modifier]:lemon yellow a lemon T-shirt 4 informal a person or thing, especially an automobile, regarded as unsatisfactory, disappointing, or feeble.