What does amethyst mean?
The definition of amethyst
Am”e*thyst,
Etym: [F. ametiste, amatiste, F. améthyste, L. amethystus, fr. Gr. Mead.]

1 (Min.)
A variety of crystallized quartz, of a purple or bluish violet color, of different shades. It is much used as a jeweler’s stone. Oriental amethyst, the violet-blue variety of transparent crystallized corundum or sapphire.
2 (Her.)
A purple color in a nobleman’s escutcheon, or coat of arms.