noun
: a dietary substance that was thought to interact with the intrinsic factor of the gastric secretion to produce the antianemic factor and that is now known to be vitamin B 12
noun
: a dietary substance that was thought to interact with the intrinsic factor of the gastric secretion to produce the antianemic factor and that is now known to be vitamin B 12
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012