Citron
A source of confusion is that "citron" or similar words in French (and other languages), and English are false friends, as they refer to the lemon. Indeed, into the 16th century, the English name "citron" included the lemon and perhaps the lime as well.
Lemon (color)
"Citron" is the French word for "lemon". This dark tone of lemon was formulated for use in interior design and fabric design.
Displayed at right is the color lemon curry.