Definify.com
Webster 1913 Edition
Citron
Cit′ron
(sĭt′rŭn)
, Noun.
 [F. 
citron
, LL. citro
, fr. L. citrus 
citron tree (cf. citreum
, sc. malum, a citron), from Gr. κίτρον 
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
. 2. 
A citron tree, 
Citrus medica
. 3. 
A citron melon. 
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
.Webster 1828 Edition
Citron
CITRON
,Noun.