lemon tree 1 , ra . 1. adj. belonger or relative to the lemon 1 .. 2. m. and f. person that sells lemons. 3. m. tree in the family Rutaceae, of four to five meters in height, always green, flowery and fruit; trunk smooth and shrub, open cup, elliptical leaves alternate, toothed, hard, lustrous, petiolate, and a beautiful green color; fragrant flowers of pink on the outside and white inside. It is native to Asia and is grown much in Spain. Its fruit is lemon 1 .. lemon tree 2 , ra . ( From lemon 2 ). 1. adj. said of a cavalry: that goes between the two rods of a car, a horse-drawn carriage, etc. U t. c. s. 2. f. Each of the two rods of a car of horses. U m in pl.