a. [ Citric + aconitic. ] Pertaining to, derived from, or having certain characteristics of, citric and aconitic acids. [ 1913 Webster ]

Citraconic acid (Chem.), a white, crystalline, deliquescent substance, C3H4(CO2H)2, obtained by distillation of citric acid. It is a compound of the ethylene series. [ 1913 Webster ]

n. [ Citrus + orange. ] A citrous fruit produced by a cross between the sweet orange and the trifoliate orange (Citrus trifoliata). It is more acid and has a more pronounced aroma than the orange; the tree is hardier. There are several varieties. [ Webster 1913 Suppl. ]

n. [ From Citric. ] (Chem.) A salt of citric acid. [ 1913 Webster ]

a. [ Cf. F. citrique. See Citron. ] (Chem.) Of, pertaining to, or derived from, the citron or lemon; as, citric acid. [ 1913 Webster ]

Citric acid (Chem.), an organic acid, C3H4OH.(CO2H)3, extracted from lemons, currants, gooseberries, etc., as a white crystalline substance, having a pleasant sour taste. [ 1913 Webster ]

n. a vitamin that maintains the resistance of cell and capillary walls to permeation; -- called also vitamin P.
Syn. -- vitamin P, bioflavinoid. [ WordNet 1.5 ]

n. [ See Citrine. ] The process by which anything becomes of the color of a lemon; esp., in alchemy, the state of perfection in the philosopher's stone indicated by its assuming a deep yellow color. Thynne. [ 1913 Webster ]

a. [ F. citrin. See Citron. ] Like a citron or lemon; of a lemon color; greenish yellow. [ 1913 Webster ]

Citrine ointment (Med.), a yellowish mercurial ointment, the unguentum hydrargyri nitratis. [ 1913 Webster ]

n. A yellow, pellucid variety of quartz. [ 1913 Webster ]

n. [ F. citron, LL. citro, fr. L. citrus citron tree (cf. citreum, sc. malum, a citron), from Gr. ki`tron citron ] 1. (Bot) A fruit resembling a lemon, but larger, and pleasantly aromatic; it is produced by the citron tree (Citrus medica). The thick rind, when candied, is the citron of commerce. The fruit was once called the lime. [ 1913 Webster ]

2. A citron tree, Citrus medica. [ 1913 Webster ]

3. A citron melon. [ 1913 Webster ]

Citron melon. (a) A small variety of muskmelon with sugary greenish flesh. (b) A small variety of watermelon, whose solid white flesh is used in making sweetmeats and preserves. --
Citron tree (Bot.), the tree which bears citrons. It was probably a native of northern India, and is now understood to be the typical form of Citrus Medica. [ 1913 Webster ]

n. a cross between Citrus sinensis and Poncirus trifoliata.
Syn. -- genus Citroncirus. [ WordNet 1.5 ]