3 occurrences in 3 dictionaries

Reference: Zamzummims

Easton

a race of giants; "a people great, and many, and tall, as the Anakims" (De 2:20-21). They were overcome by the Ammonites, "who called them Zamzummims." They belonged to the Rephaim, and inhabited the country afterwards occupied by the Ammonites. It has been conjectured that they might be Ham-zuzims, i.e., Zuzims dwelling in Ham, a place apparently to the south of Ashteroth (Ge 14:5), the ancient Rabbath-ammon.

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Fausets

De 2:20. A giant race identified with the Zuzim of Ge 14:5. Then "Ham" would be the chief city of the Zuzim and the root derivation of Ammon's capital, Rubbath Ammon. They dwelt where Ammon, having dislodged them, afterward dwelt when Israel invaded Canaan. E. of the modern rich and undulating Belka, from whence the Amorites expelled Moab. Zamzummims was the Ammonite name for the Rephaim, N.E. of Jordan, Peraea; the Rephaim once extended S.W. as far as the valley of the Rephaim near Hinnom and Bethlehem, S. of Jerusalem.

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Morish

Zamzum'mims

See ZUZIMS.