what is a lemon
lemon - yellow oval fruit with juicy acidic flesh. lemon peel, lemon rind - the rind of a lemon. citrous fruit, citrus, citrus fruit - any of numerous fruits of the genus Citrus having thick rind and juicy pulp; grown in warm regions. Citrus limon, lemon tree, lemon - a small evergreen tree that originated in Asia but is widely cultivated for its fruit. lemon yellow, maize, gamboge. yellow, yellowness - yellow color or pigment; the chromatic color resembling the hue of sunflowers or ripe lemons.