turquoise: [14] Turquoise is etymologically the ‘Turkish’ stone. The word was borrowed from Old French turqueise, short for pierre turqueise ‘Turkish stone’. The stone was so called because it was first found in Turkestan. The present-day form of the word, which dates from the 16th century, is due to the influence of modern French turquoise. It was first used as a colour adjective in the late 16th century. [turquoise etymology, turquoise origin, 英语词源]