In Italian these specific fruits are not "limoni" they are "cedri", but in latin there is citrus (as the name of the plant/tree) and citreum (as the name of the

In Italian these specific fruits are not "limoni" they are "cedri", but in latin there is citrus (as the name of the plant/tree) and citreum (as the name of the fruit) that means lemon so it is not strange that the French has citron that seems not Germanic at all. It is not clear at all whether what the Romans had were limoni, cedri or lime/limette, or all of them and whether they were only imported or actually cultivated locally. The lemon/limone etc. come from Arabic/Eastern languages and has evidently been "imported" in most romance languages. The scientific name of the lemon, "Citrus limon" settles it: https://en.wikipedia.org/wiki/Lemon https://en.wikipedia.org/wiki/Lemon