Definition of amethyst noun from the Oxford Advanced Learner's Dictionary

 

amethyst

 noun
noun
BrE BrE//ˈæməθɪst//
 
; NAmE NAmE//ˈæməθɪst//
 
[countable, uncountable] Jewellery
 
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a purple semi-precious stone, used in making jewellery an amethyst ring See related entries: Jewellery Word Origin Middle English: via Old French from Latin amethystus, from Greek amethustos ‘not drunken’ (because the stone was believed to prevent intoxication).
See the Oxford Advanced American Dictionary entry: amethyst