■ noun any of a group of substances essential for the working of certain enzymes in the body, including thiamine ( ~ 1 ), riboflavin ( ~ 2 ), pyridoxine ( ~ 6 ), and cyanocobalamin ( ~ 12 ).
VITAMIN B
Meaning of VITAMIN B in English
Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004