gallium n.

1670s, "of or pertaining to the French," from Latin Gallicus "pertaining to Gaul or the Gauls," from Latin Gallia "Gaul" and Gallus "a Gaul" from a native Celtic name (see Gaelic), though some connect the word with prehistoric West Germanic *walkhoz "foreigners" (see Welsh). Originally used in English rhetorically or mockingly for "French." The cock as a symbol of France is based on the pun of Gallus "a Gaul" and Latin gallus "cock" (see gallinaceous). Earlier was Gallican (1590s).

It means not simply 'French,' but 'characteristically', 'delightfully', 'distressingly', or 'amusingly' 'French' ... not 'of France', but 'of the typical Frenchman'. [Fowler]

As "of or pertaining to the ancient Gauls" from 1796.

"of or resembling domestic fowl," 1783, from Latin gallinaceus "of hens, of fowls, pertaining to poultry," from gallina "hen," a fem. formation from gallus "cock," probably from PIE root *gal- "to call, shout," as "the calling bird." But it also has an ancient association with Gaul (see Gallic), and some speculate that this is the source of the word, "on the assumption that the Romans became acquainted with the cock from Gaul, where it was brought by the Phoenicians" [Buck].