Strong's Concordance

Original word: ὕαλος
Transliteration: hualos
Definition (short): glass
Definition (full): a clear transparent stone, glass

NAS Exhaustive Concordance

Word Origin: probably of foreign origin
Definition: a clear transparent stone, glass
NASB Translation: glass (2).
NAS Exhaustive Concordance of the Bible with Hebrew-Aramaic and Greek Dictionaries.
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Strong's Exhaustive Concordance

Perhaps from the same as huetos (as being transparent like rain); glass -- glass.

see GREEK huetos

KJV: And the building of the wall of it was of jasper: and the city was pure gold, like unto clear glass.
NASB: The material of the wall was jasper; and the city was pure gold, like clear glass.
KJV: And the twelve gates were twelve pearls; every several gate was of one pearl: and the street of the city was pure gold, as it were transparent glass.
NASB: And the twelve gates were twelve pearls; each one of the gates was a single pearl. And the street of the city was pure gold, like transparent glass.