1. (Science: botany) An oval or roundish fruit resembling the orange, and containing a pulp usually intensely acid. It is produced by a tropical tree of the genus Citrus,the common fruit known in commerce being that of the species c. Limonum or c. Medica (var. Limonum). There are many varieties of the fruit, some of which are sweet.
(Science: botany) lemon grass, a white crystalline substance, inappropriately named, as it consists of an acid potassium oxalate and contains no citric acid, which is the characteristic acid of lemon; called also salis of sorrel. It is used in removing ink stains. See oxalic acid, under oxalic.