noun
: a substance produced by normal stomach and intestinal mucosa that facilitates absorption of vitamin B 12 from the gastrointestinal tract and thereby assists in the development and maturation of red blood cells — compare extrinsic factor
noun
: a substance produced by normal stomach and intestinal mucosa that facilitates absorption of vitamin B 12 from the gastrointestinal tract and thereby assists in the development and maturation of red blood cells — compare extrinsic factor
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012