Etymology
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entero- 
before vowels enter-, word-forming element meaning "intestine," from Greek enteron "an intestine, piece of gut" (see enteric).
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litho- 
before vowels, lith-, word-forming element meaning "stone, rock;" from Greek lithos "stone, a precious stone, marble; a piece on a game board," a word of unknown origin.
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xylo- 
before vowels xyl-, word forming element meaning "wood," from Greek xylon "wood cut and ready for use, firewood, timber; piece of wood; stocks, a plank, beam, or bench," in New Testament, "the Cross," a word of uncertain origin. It seems to correspond with Lithuanian šulas "post, pole, stave," Russian šulo "garden-pole," Serbo-Croatian šulj "block," Old High German sul "style, pole," Gothic sauls "pillar," but the exact relationship is unclear, and Beekes asks, "Was the word taken from a non-IE substrate language?"
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