Definition of Extrinsic
Foreign; from outside sources; dehors. As to “Extrinsic fraud”, see Fraud.
Grounds for quashing of indictment may be matters “intrinsic” to the pleading, as defects apparent upon its face. United States v. Frankfeld, D.C.D.C., 38 F.Supp. 1018, 1019.
That's the definition of Extrinsic in Black's Law Dictionary 6th Edition. Courtesy of Cekhukum.com.