Nephilim

Nephilim are beings who appear the Hebrew Bible, in the Book of Genesis and are also mentioned in other biblical texts and in some non-canonical Jewish writings.
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(n. pl.)
Giants.
  

[Judaic] Genesis 6:4 states "The Nephilim were on the earth in those days --and also afterwards-- when the sons of God went to the daughters of men and had children by them. They were the heroes of old, men of renown." The Nephilim were a race of giants that were produced by the sexual union of the sons of God (presumably fallen angels) and the daughters of men. Translated from the Hebrew texts, "Nephilim" means "fallen ones." They were renowned for their strength, prowess, and a great capacity for sinfulness. The origination of the Nephilim begins with a story of the fallen angels. Shemhazai, an angel of high rank, led a sect of angels in a descent to earth to instruct humans in righteousness. The tutelage went on for a few centuries, but soon the angels pined for the human females. After lusting, the fallen angels instructed the women in magic and conjuring, mated with them, and produced hybrid offspring: the Nephilim. The Nephilim were gigantic in stature. Their strength was prodigious a...
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Nephilim (Hebrew) [from naphal to fall] Giants (cf Genesis 4:4); any being, entity, or thing which falls from a higher to a lower estate, whether in the spirit, the astral, or the physical world. Thus the nephilim signify in one field of thought the manasaputras who fell into incarnation; also the human race at a later date which fell into physical generation; and other meanings implying descent. Termed Fallen Angels and equated with the third root-race and with the fallen ones of the fourth root-race (SD 2:279, 775). Theological tradition associates the nephilim with hairy men or satyrs.

(Gen. 6:4; Num. 13:33, R.V.), giants, the Hebrew word left untranslated by the Revisers, the name of one of the Canaanitish tribes. The Revisers have, however, translated the Hebrew gibborim, in Gen. 6:4, "mighty men."