holo- Look up holo- at Dictionary.com
before vowels, hol-, word-forming element meaning "whole, entire, complete," from Greek holos "whole, entire, complete," also "safe and sound;" as a noun, "the universe," as an adverb, "on the whole;" from PIE *sol-wo-, from root *sol- "whole" (see safe (adj.)). Often translated as whole, which it resembles but with which it apparently has no etymological connection.