13 letters · 17 points in Scrabble
adjective consisting of elements that are not of the same kind or nature
adjective originating outside the body
originFrom Medieval Latin heterogeneus, from Ancient Greek ἑτερογενής (heterogenḗs, “of different kinds”), from ἕτερος (héteros, “other, another, different”) + γένος (génos, “kind”). Compare hetero- and -ous.
Etymology from Wiktionary, CC BY-SA 3.0