9 letters · 11 points in Scrabble
adjective belonging to a thing by its very nature; - John Dewey
adjective situated within or belonging solely to the organ or body part on which it acts
originFrom Middle French intrinsèque, from Latin intrīnsecus (“on the inside, inwardly”), from *intrim, an assumed adverbial form of inter (“within”) + secus (“by, on the side”).
Etymology from Wiktionary, CC BY-SA 3.0