a purple or violet quartz, used as a gem.
a purplish tint.
having the color of amethyst.
containing or set with an amethyst or amethysts: an amethyst brooch.

1250–1300; < Latin amethystus < Greek améthystos not intoxicating, not intoxicated (so called from a belief that it prevented drunkenness), equivalent to a- a-6 + methys- (variant stem of methýein to intoxicate; see methylene) + -tos verbal adjective suffix; replacing Middle English ametist < Anglo-French ametiste < Latin

amethystine [am-uh-this-tin, -tahyn] , adjective
amethystlike, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
amethyst (ˈæmɪθɪst)
1.  a purple or violet transparent variety of quartz used as a gemstone. Formula: SiO2
2.  a purple variety of sapphire; oriental amethyst
3.  the purple colour of amethyst
[C13: from Old French amatiste, from Latin amethystus, from Greek amethustos, literally: not drunken, from a-1 + methuein to make drunk; referring to the belief that the stone could prevent intoxication]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

violet quartz, late 13c., from O.Fr. ametiste (Mod.Fr. améthyste), from L. amethystus, from Gk. amethystos "amethyst," lit. "not intoxicating," from a- "not" + methyskein "make drunk," from methys "wine;" based on the stone's ancient reputation for preventing drunkenness. Spelling restored from
M.E. ametist.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
amethyst   (ām'ə-thĭst)  Pronunciation Key 
A purple or violet, transparent form of quartz used as a gemstone. The color is caused by the presence of iron compounds in the crystal structure.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Bible Dictionary

Amethyst definition

one of the precious stones in the breastplate of the high priest (Ex. 28:19; 39:12), and in the foundation of the New Jerusalem (Rev. 21:20). The ancients thought that this stone had the power of dispelling drunkenness in all who wore or touched it, and hence its Greek name formed from _a_, "privative," and _methuo_, "to get drunk." Its Jewish name, _ahlamah'_, was derived by the rabbins from the Hebrew word _halam_, "to dream," from its supposed power of causing the wearer to dream. It is a pale-blue crystallized quartz, varying to a dark purple blue. It is found in Persia and India, also in different parts of Europe.

Easton's 1897 Bible Dictionary
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Example sentences
Amethyst is a light or dark purple variety of quartz.
Amethyst, a variety of quartz, is always violet or purple.
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