| backwardness | (noun) lack of normal development of intellectual capacities | Synonyms: mental retardation, retardation, slowness, subnormality |
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| backwards | (adverb) in a manner or order or direction the reverse of normal | Synonyms: backward |
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| (adverb) at or to or toward the back or rear | Synonyms: back, backward, rearward, rearwards |
| backwash | (noun) the wave that spreads behind a boat as it moves forward | Synonyms: wake |
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| (noun) the flow of air that is driven backwards by an aircraft propeller | Synonyms: airstream, race, slipstream, wash |
| (noun) the consequences of an event (especially a catastrophic event) | Synonyms: aftermath, wake |
| backwater | (noun) a place or condition in which no development or progress is occurring | - |
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| (noun) a body of water that was created by a flood or tide or by being held or forced back by a dam | - |
| backwoods | (noun) a remote and undeveloped area | Synonyms: back country, boondocks, hinterland |
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| backwoodsman | (noun) a man who lives on the frontier | Synonyms: frontiersman, mountain man |
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| backyard | (noun) the grounds in back of a house | - |
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| bacon | (noun) back and sides of a hog salted and dried or smoked; usually sliced thin and fried | - |
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| bacteremia | (noun) transient presence of bacteria (or other microorganisms) in the blood | Synonyms: bacteriaemia, bacteriemia |
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| bacteremic | (adjective) of or relating to or having bacteremia | - |
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| bacteria | (noun) (microbiology) single-celled or noncellular spherical or spiral or rod-shaped organisms lacking chlorophyll that reproduce by fission; important as pathogens and for biochemical properties; taxonomy is difficult; often considered to be plants | Synonyms: bacterium |
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| bacteriacide | (noun) any chemical agent that destroys bacteria | Synonyms: bactericide |
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| bacteriaemia | (noun) transient presence of bacteria (or other microorganisms) in the blood | Synonyms: bacteremia, bacteriemia |
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| bacterial | (adjective) relating to or caused by bacteria | - |
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| bacterially | (adverb) by bacteria | - |
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| bactericidal | (adjective) preventing infection by inhibiting the growth or action of microorganisms | Synonyms: disinfectant, germicidal |
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| bactericide | (noun) any drug that destroys bacteria or inhibits their growth | Synonyms: antibacterial, antibacterial drug |
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| (noun) any chemical agent that destroys bacteria | Synonyms: bacteriacide |
| bacteriemia | (noun) transient presence of bacteria (or other microorganisms) in the blood | Synonyms: bacteremia, bacteriaemia |
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| bacteriochlorophyll | (noun) a substance in photosensitive bacteria that is related to but different from chlorophyll of higher plants | - |
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| bacterioid | (adjective) resembling bacteria | Synonyms: bacterioidal, bacteroid, bacteroidal |
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| bacterioidal | (adjective) resembling bacteria | Synonyms: bacterioid, bacteroid, bacteroidal |
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| bacteriologic | (adjective) of or relating to bacteriology | Synonyms: bacteriological |
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| bacteriological | (adjective) of or relating to bacteriology | Synonyms: bacteriologic |
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| bacteriologist | (noun) a biologist who studies bacteria | - |
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| bacteriology | (noun) the branch of medical science that studies bacteria in relation to disease | - |
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| bacteriolysis | (noun) dissolution or destruction of bacteria | - |
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| bacteriolytic | (adjective) of or relating to or causing bacteriolysis | - |
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| bacteriophage | (noun) a virus that is parasitic (reproduces itself) in bacteria | Synonyms: phage |
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| bacteriophagic | (adjective) of or relating to bacteriophages | Synonyms: bacteriophagous |
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| bacteriophagous | (adjective) of or relating to bacteriophages | Synonyms: bacteriophagic |
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| bacteriostasis | (noun) inhibition of the growth of bacteria | - |
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| bacteriostat | (noun) a chemical or biological material that inhibits bacterial growth | - |
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| bacteriostatic | (adjective) of or relating to or causing bacteriostasis | - |
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| bacterise | (verb) subject to the action of bacteria | Synonyms: bacterize |
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| bacterium | (noun) (microbiology) single-celled or noncellular spherical or spiral or rod-shaped organisms lacking chlorophyll that reproduce by fission; important as pathogens and for biochemical properties; taxonomy is difficult; often considered to be plants | Synonyms: bacteria |
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| bacterize | (verb) subject to the action of bacteria | Synonyms: bacterise |
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| bacteroid | (adjective) resembling bacteria | Synonyms: bacterioid, bacterioidal, bacteroidal |
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| (noun) a rodlike bacterium (especially any of the rod-shaped or branched bacteria in the root nodules of nitrogen-fixing plants) | - |
| bacteroidal | (adjective) resembling bacteria | Synonyms: bacterioid, bacterioidal, bacteroid |
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| baculiform | (adjective) formed like a bacillus | Synonyms: bacillar, bacillary, bacilliform, rod-shaped |
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