Webster's English Dictionary

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lemon

1. lem.on \'lem-*n\ n [ME lymon, fr. MF limon, fr. ML limon-, limo, fr. Ar 
   Xlaymu-n 1a: an acid fruit that is botanically a many-seeded pale yellow 
   oblong berr y 1b: the stout thorny tree (Citrus limon) that bears this 
   fruit  2: DUD, FAILURE 
2. lemon aj 1a: containing lemon  1b: having the flavor or scent of lemon  
   2: of the color lemon yellow