Amethyst - Vine's Expository Dictionary of New Testament Words

Amethyst

[ 1,,G271, amethustos ]
primarily meaning not drunken" (a, negative, and methu, "wine"), became used as a noun, being regarded as possessing a remedial virtue against drunkenness. Pliny, however, says that the reason for its name lay in the fact that in color it nearly approached that of wine, but did not actually do so, Revelation 21:20.

Vine's Expository Dictionary of New Testament Words