The term intrinsic in electronics is used to describe an undoped semiconductor material. In this case, the semiconductor material is in its pure state and doesn't have any impurities added on it to modify its conductivity. An intrinsic semiconductor is neither a good insulator nor a good conductor.
Intrinsic refers to the generic properties of pure materials.
Microelectronic Circuit Design, 4th Edition by Richard C. Jaeger & Travis N. Blalock