Deuteronomy 2:20

Before the Ammonites, the laud was occupied by a gigantic race, called by them, Zamzummim (probably noisy ones , from זָמַם to hum, mutter; or, as the verb also signifies, to muse or meditate, perhaps moody ones ; whether the same as the Zuzim of Genesis 14:5 — LXX ; ἔθνη ἰσχυρά , as if from זוּז , to overflow, to abound—is uncertain). The colossal stone monuments, resembling what in Europe are known by the Celtic names of dolmen , menhir , and cromlech , still to be found in the land of Moab, are supposed to be the work of these aboriginal inhabitants of the country, the gigantic Emim and Zamzummim. This giant tribe the Lord had destroyed before the Ammonites, just as he had destroyed the Horim before the children of Esau in Seir.