1. [ noun ] (immunology) the blood group whose red cells carry the B antigen
Synonyms: group_B type_B
Related terms: blood_group
2. [ noun ] (biology) aerobic rod-shaped spore-producing bacterium; often occurring in chainlike formations; found primarily in soil
Synonyms: bacilli bacillus
Related terms: eubacteria bacillus_globigii anthrax yersinia_pestis genus_Bacillus
3. [ noun ] (chemistry) a trivalent metalloid element; occurs both in a hard black crystal and in the form of a yellow or brown powder
Synonyms: atomic_number_5 boron
Related terms: chemical_element kernite borax
4. [ noun ] originally thought to be a single vitamin but now separated into several B vitamins
Synonyms: B_vitamin B_complex vitamin_B vitamin_B_complex B-complex_vitamin
Related terms: water-soluble_vitamin vitamin_B1 vitamin_B2 vitamin_B6 niacin inositol vitamin_B12 vitamin_Bc pantothenic_acid biotin choline
5. [ noun ] the 2nd letter of the Roman alphabet
Related terms: letter Roman_alphabet
6. [ noun ] (atomic or nuclear physics) a unit of nuclear cross section; the effective circular area that one particle presents to another as a target for an encounter
Synonyms: barn
Related terms: area_unit nuclear_physics
7. [ noun ] (physics,acoustics) a logarithmic unit of sound intensity equal to 10 decibels
Synonyms: bel
Related terms: sound_unit
Similar spelling:   Bo