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| b | the second letter of the English alphabet bel (Units & Measurements) | ||
| B | Boron (Chemical symbol) 11 (hexadecimal notation) 7th note in C major (music) second highest grade (education) one of the human blood types (Medicine) | ||
| Bacillophobia | fear of microbes (see list of phobias) | ||
| Bacteriology | study of bacteria (see list of branches of science) | ||
| Bacteriophobia | fear of bacteria (see list of phobias) | ||
| Ballistophobia | fear of missiles or bullets (see list of phobias) | ||
| Balneology | study of the therapeutic use of baths (see list of branches of science) | ||
| Barodynamics | study of the support and mechanics of bridges (see list of branches of science) | ||
| Barology | study of gravitational force (see list of branches of science) | ||
| Barophobia | fear of gravity (see list of phobias) | ||
| Basiphobia | fear of walking or falling or inability to stand (see list of phobias) | ||
| Basophobia | fear of walking or falling or inability to stand (see list of phobias) | ||
| Bathmophobia | fear of stairs or steep slopes (see list of phobias) | ||
| Bathophobia | fear of depth (see list of phobias) | ||
| Bathymetry | study of underwater depth of ocean floors or lake floors (see list of branches of science) | ||
| Batology | study of brambles (see list of branches of science) | ||
| Batophobia | fear of heights or being close to high buildings (see list of phobias) | ||
| Batrachophobia | fear of frogs and other amphibians (see list of phobias) | ||
| Belonephobia | fear of pins and needles (see list of phobias) | ||
| Bibliology | study of books (see list of branches of science) | ||
| Bibliophobia | fear of books (see list of phobias) | ||
| Bibliotics | study of documents to determine authenticity (see list of branches of science) | ||
| Biochemistry | study of chemical processes within and relating to living organism (see list of branches of science) | ||
| Bioecology | study of interaction of life in the environment (see list of branches of science) | ||
| Biology | study of life (see list of branches of science) | ||
| Biomechanics | study of the structure, function and motion of the mechanical aspects of biological systems (see list of branches of science) | ||
| Biometrics | study of biological measurement for security purposes (see list of branches of science) | ||
| Bionomics | study of organisms interacting in their environments (see list of branches of science) | ||
| Biophysics | study of physics of biological phenomena (see list of branches of science) | ||
| Biopsychology | study of application of the biology to psychology (see list of branches of science) | ||
| Biotribology | study of friction, wear and lubrication of biological systems (see list of branches of science) | ||
| Blennophobia | fear of slime (see list of phobias) | ||
| Bogyphobia | fear of bogeys or the bogeyman (see list of phobias) | ||
| Bolshephobia | fear of bolsheviks (see list of phobias) | ||
| Botanophobia | fear of plants (see list of phobias) | ||
| Botany | study of plants (see list of branches of science) | ||
| Bromatology | study of food (see list of branches of science) | ||
| Bromidrophobia | fear of body smells (see list of phobias) | ||
| Bromidrosiphobia | fear of body smells (see list of phobias) | ||
| Brontophobia | fear of thunder and lightning (see list of phobias) | ||
| Bryology | study of mosses and liverworts (see list of branches of science) | ||
| Bufonophobia | fear of toads (see list of phobias) | ||
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