[cit.ron] n [ME, fr. MF, modif. of L citrus] (15c) 1 a: a citrus fruit resembling a lemon but larger with little pulp and a very thick rind b: a small shrubby tree (Citrus medica) that produces citrons and is cultivated in tropical regions c: the preserved rind of the citron used esp. in cakes and puddings
2: a small hard-fleshed watermelon used esp. in pickles and preserves