/ ˈtɜːkwɔɪz; NAmE ˈtɜːrk-/ noun
1.
[ C , U ] a blue or greenish-blue semi-precious stone :
a turquoise brooch
2.
[ U ] a greenish-blue colour
► tur·quoise adjective :
a turquoise dress
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WORD ORIGIN
late Middle English : from Old French turqueise Turkish (stone).