What is the meaning of Citron?

A greenish yellow colour.

A small citrus tree, Citrus medica.

The fruit of a citron tree.

The candied rind of the citron fruit.

Of a greenish yellow colour.

lemon

lemon (yellowish citrus fruit; taste or flavor of lemons)

accusative singular of citro

lemon

lime

brimstone

noggin (head)

lemon (defective item)

East Asian

lemon

Source: wiktionary.org