1a pale yellow oval citrus fruit with thick skin and fragrant, acidic juice:the juice of seven lemons [mass noun]:garnish with a slice of lemon [as modifier]:lemon juice
[mass noun] a drink made from or flavoured with lemon juice:a port and lemon
2 (also lemon tree) the evergreen citrus tree which produces lemons, widely cultivated in warm climates.
Citrus limon, family Rutaceae
Citrus limon, family Rutaceae
3 [mass noun] a pale yellow colour: [as modifier]:a lemon T-shirt
4 informal an unsatisfactory or feeble person or thing:car-makers cannot afford to create lemons