1. a substance produced by the mucosa of the stomach and intestines that is essential for the absorption of vitamin B12; - Example: "lack of intrinsic factor can result in pernicious anemia"
WordNet (r) 3.0 (2006):
intrinsic factor
n 1: a substance produced by the mucosa of the stomach and
intestines that is essential for the absorption of vitamin
B12; "lack of intrinsic factor can result in pernicious
anemia"