Strong's Concordance

Original word: רֶ֫תַח
Transliteration: rethach
Definition (short): vigorously
Definition (full): a boiling

NAS Exhaustive Concordance

Word Origin: from rathach
Definition: a boiling
NASB Translation: vigorously (1).
NAS Exhaustive Concordance of the Bible with Hebrew-Aramaic and Greek Dictionaries.
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Strong's Exhaustive Concordance

From rathach; a boiling -- X (boil) well.

see HEBREW rathach

KJV: Take the choice of the flock, and burn also the bones under it, and make it boil well, and let them seethe the bones of it therein.
NASB: "Take the choicest of the flock, And also pile wood under the pot. Make it boil vigorously. Also seethe its bones in it."