Meaning

noun a cruel wicked and inhuman person

noun (folklore) a giant who likes to eat human beings

originFirst attested in the 18th century, borrowed from French ogre, from Latin Orcus (“god of the underworld”), from Ancient Greek Ὅρκος (Hórkos), the personified demon of oaths (ὅρκος (hórkos, “oath”)) who inflicts punishment upon oath-breakers. Doublet of orc and Orcus.

Etymology from Wiktionary, CC BY-SA 3.0