From BiblePortal Wikipedia

Fausset's Bible Dictionary [1]

A giant war-like race, which occupied the region E. of the Dead Sea, in which the Moabites succeeded them ( Genesis 14:5;  Deuteronomy 2:10). Perhaps related to "Amu" the Egyptian word in the hieroglyphics for nomadic Shemites. The Hebrew means "terrible ones." The Rephaim were on the N.E. of Jordan, the Zuzim next, then the Emim, then the Horim on the S.E.; all gigantic.

Morrish Bible Dictionary [2]

A people, described as "great, and many, and tall, as the Anakims," who dwelt on the east of the Dead Sea. They were smitten by Chedorlaomer and his confederate kings and their land eventually passed to the Moabites, who called the people EMIM, that is, 'terrible.'  Genesis 14:5;  Deuteronomy 2:10,11 .

Hastings' Dictionary of the Bible [3]

EMIM . Primitive inhabitants of Moab, a gigantic people of Hebrew tradition ( Rephaim ,   Deuteronomy 2:10 f., cf.   Genesis 14:5 ).

J. F. McCurdy.

American Tract Society Bible Dictionary [4]

A gigantic and warlike race, who in the time of Abraham occupied the country beyond the Jordan, afterwards possessed by the Moabites,  Genesis 14:5   Deuteronomy 2:10 .

Holman Bible Dictionary [5]

 Genesis 14:6 Deuteronomy 2:10-11Rephaim

Cyclopedia of Biblical, Theological and Ecclesiastical Literature [6]

(Hebrews Eynim', אֵימַים , Terrors; Sept. Ο᾿Μμαῖοι and Ο᾿Μμείν ; Auth. Vers. "Emims"), a numerous and warlike tribe of the ancient Canaanites, of gigantic stature, defeated by Chedorlaomer and his allies in the plain of Kiriathaim; they occupied, in the time of Abraham, the country east of the Jordan, afterwards possessed by the Moabites ( Genesis 14:5;  Deuteronomy 2:10-11). (See Canaan). An ingenious writer in the Jour. Of Sac. Lit. (April, 1852, page 55 sq.; January 1853, page 296) argues, but upon rather slender grounds, that their original title was Shittim, and identifies them with the Chetta so often referred to in the Egyptian inscriptions. It would appear, from a comparison of  Genesis 14:5-7 with  Deuteronomy 2:10-12;  Deuteronomy 2:20-23, that the whole country east of Jordan was, in primitive times, held by a race of giants, all probably of the same stock, comprehending the Rephaim on the north, next the Zuzim, after them the Emim, and then the Horim on the south; and that afterwards the kingdom of Bashan embraced the territories of the first; the country of the Ammonites, the second; that of the Moabites, the third; while Edom took in the mountains of the Horim. The whole of them. were attacked and pillaged by the Eastern kings who destroyed Sodom and Gomorrah. (See Rephaim). The Emim were related to the Anakim, and were generally called by the same name; but their conquerors, the Moabites, termed them Emimthat is, "Terrible men" ( Deuteronomy 2:11) most probably on account of their fierce aspect. (See Anakim).

International Standard Bible Encyclopedia [7]

ē´mim ( אימים , 'ēmı̄m  ; Ὀμμαείν , Ommaeı́n , Ὀμμείν , Ommeı́n , or Ὀμμιείν , Ommieı́n ): Stated to have been the earlier inhabitants of Moab ( Deuteronomy 2:10 ,  Deuteronomy 2:11 ), and to have been of tall stature, and hence, "accounted Rephaim (or giants) as the Anakim" or the Zamzummim of Ammon ( Deuteronomy 2:20 ). As the name was given to them by the Moabites, it may not have been that by which they called themselves. A tall race, known to the Israelites as Rephaim (which see), once existed in Southern Palestine as well as on the East side of the Jordan, but its exact relationship is unknown. In the time of Abraham the Emim were living in the Moabite district of Shaveh-kiriathaim, identified with the modern Kureiyat ( Genesis 14:5 ).

Kitto's Popular Cyclopedia of Biblial Literature [8]

E´mim, a numerous and gigantic race of people who, in the time of Abraham, occupied the country beyond the Jordan, afterwards possessed by the Moabites .