Au 词源(Etymology) - 趣词词源[英文版]

Au [Au 词源字典]: chemical symbol for "gold," from Latin aurum "gold" (see aureate).[Au etymology, Au origin, 英语词源]
au: French, "at the, to the," from Old French al, contraction of a le, with -l- softened to -u-, as also poudre from pulverem, chaud from calidus, etc. Used in many expressions in cookery, etc., which have crossed the Channel since 18c., such as au contraire, literally "on the contrary;" au gratin, literally "with scrapings;" au jus, literally "with the juice."