Pronunciation: (ik-strin'sik, -zik),[key] —adj. 1. not essential or inherent; not a basic part or quality; extraneous: facts that are extrinsic to the matter under discussion. 2. being outside a thing; outward or external; operating or coming from without: extrinsic influences. 3. Anat.(of certain muscles, nerves, etc.) originating outside the anatomical limits of a part. Also,ex•trin'si•cal.