carbuncle

Concise Bible Dictionary:

Two Hebrew words are so translated.
Cabochon Carbuncle Garnet

Strong’s Dictionary of Hebrew Words:

Transliteration:
’eqdach
Phonic:
ek-dawkh’
Meaning:
from 6916; burning, i.e. a carbuncle or other fiery gem
KJV Usage:
carbuncle

Jackson’s Dictionary of Scripture Proper Names:

I will kindle (only in Isa. 54:12) : lightning stone: (literally she shot forth)