The word extrinsic in electronics is used to describe a semiconductor material that has been doped with impurity atoms. Since an intrinsic semiconductor is not really that useful in the field of electronics, it must be doped with impurity atoms to increase its conductivity. The doped semiconductor material is now called extrinsic semiconductor, which could be an n-type if its majority current carriers are free electrons, or a p-type if its majority current carriers are holes.
Materials containing donor and/or acceptor atoms.
Microelectronic Circuit Design, 4th Edition by Richard C. Jaeger & Travis N. Blalock