CITRON

noun Etymology: Middle French, modification of Latin citrus Date: 1530 1. a citrus fruit resembling a lemon but larger with little pulp and a very thick rind, a small shrubby tree ( Citrus medica ) that produces ~s and is cultivated in tropical regions, the preserved rind of the ~ used especially in cakes and puddings, a small hard-fleshed watermelon used especially in pickles and preserves