Amethyst

Concise Bible Dictionary:

What we know as amethyst (not necessarily the same stone).

Strong’s Dictionary of Greek Words:

Greek:
ἀμέθυστος
Transliteration:
amethustos
Phonic:
am-eth’-oos-tos
Meaning:
from 1 (as a negative particle) and a derivative of 3184; the "amethyst" (supposed to prevent intoxication)
KJV Usage:
amethyst

Jackson’s Dictionary of Scripture Proper Names:

dream-stone (literally I shall be brought back—as from a dream)