a group of unrelated water-soluble vitamins found in liver, yeast, etc., including: a) vitamin B (see thiamine) b) vitamin B (see riboflavin) c) vitamin B (see pyridoxine) d) nicotinic acide) pantothenic acidf) bioting) inositolh) para-aminobenzoic acidi) cholinej) folic acidk) vitamin B a complex vitamin, CHNOPCo, containing trivalent cobalt, essential for the normal maturation of erythrocytes, and for normal growth and neurological function, and used esp. in treating pernicious anemia and as an animal feed supplement