B
The noun has 6 meanings:
Meaning #1:
the blood group whose red cells carry the B antigen
Synonyms: type B, group B
Meaning #2:
aerobic rod-shaped spore-producing bacterium; often occurring in chainlike formations
Synonyms: bacillus, bacilli
Meaning #3:
originally thought to be a single vitamin but now separated into several B vitamins
Synonyms: B-complex vitamin, B complex, vitamin B complex,
Meaning #4:
a trivalent metalloid element; occurs both in a hard black crystal and in the form of a yellow or brown powder
Synonyms: boron, atomic number 5
Meaning #5:
a logarithmic unit of sound intensity equal to 10 decibels
Synonym: bel
Meaning #6:
the 2nd letter of the Roman alphabet






