Strong's Concordance

Original word: כַּרְכֹּב
Transliteration: karkob
Definition (short): ledge
Definition (full): border, rim (of an altar)

NAS Exhaustive Concordance

Word Origin: from an unused word
Definition: border, rim (of an altar)
NASB Translation: ledge (2).
NAS Exhaustive Concordance of the Bible with Hebrew-Aramaic and Greek Dictionaries.
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Strong's Exhaustive Concordance

Expanded from the same as Kabbown; a rim or top margin -- compass.

see HEBREW Kabbown

KJV: And thou shalt put it under the compass of the altar beneath, that the net may be even to the midst of the altar.
NASB: "You shall put it beneath, under the ledge of the altar, so that the net will reach halfway up the altar.
KJV: And he made for the altar a brasen grate of network under the compass thereof beneath unto the midst of it.
NASB: He made for the altar a grating of bronze network beneath, under its ledge, reaching halfway up.