| abasia | (noun) inability to walk | - |
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| basic | (noun) (usually in the plural) a necessary commodity for which demand is constant | Synonyms: staple |
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| basics | (noun) principles from which other truths can be derived | Synonyms: basic principle, bedrock, fundamental principle, fundamentals |
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| (noun) a statement of fundamental facts or principles | Synonyms: rudiments |
| basidiocarp | (noun) the fruiting body of a basidiomycete which bears its spores on special cells | - |
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| basidiolichen | (noun) a lichen in which the fungus component is a basidiomycete | - |
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| basidiomycete | (noun) any of various fungi of the subdivision Basidiomycota | Synonyms: basidiomycetous fungi |
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| basidiospore | (noun) a sexually produced fungal spore borne on a basidium | - |
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| basidium | (noun) a small club-shaped structure typically bearing four basidiospores at the ends of minute projections; unique to basidiomycetes | - |
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| basil | (noun) leaves of the common basil; used fresh or dried | Synonyms: sweet basil |
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| (noun) any of several Old World tropical aromatic annual or perennial herbs of the genus Ocimum | - |
| basileus | (noun) a ruler of the eastern Roman Empire | - |
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| basilica | (noun) a Roman building used for public administration | Synonyms: Roman basilica |
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| (noun) an early Christian church designed like a Roman basilica; or a Roman Catholic church or cathedral accorded certain privileges | - |
| basilisk | (noun) small crested arboreal lizard able to run on its hind legs; of tropical America | - |
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| (noun) ancient brass cannon | - |
| (noun) (classical mythology) a serpent (or lizard or dragon) able to kill with its breath or glance | - |
| basin | (noun) a bowl-shaped vessel; usually used for holding food or liquids | - |
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| (noun) a bathroom sink that is permanently installed and connected to a water supply and drainpipe; where you can wash your hands and face | Synonyms: lavatory, washbasin, washbowl, washstand |
| (noun) the entire geographical area drained by a river and its tributaries; an area characterized by all runoff being conveyed to the same outlet | Synonyms: catchment area, catchment basin, drainage area, drainage basin, river basin, watershed |
| (noun) a natural depression in the surface of the land often with a lake at the bottom of it | - |
| (noun) the quantity that a basin will hold | Synonyms: basinful |
| basinet | (noun) a medieval steel helmet | - |
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| basinful | (noun) the quantity that a basin will hold | Synonyms: basin |
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| basis | (noun) the fundamental assumptions from which something is begun or developed or calculated or explained | Synonyms: base, cornerstone, foundation, fundament, groundwork |
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| (noun) a relation that provides the foundation for something | Synonyms: footing, ground |
| (noun) the most important or necessary part of something | Synonyms: base |
| chabasite | (noun) a group of minerals of the zeolite family consisting of a hydrous silicate of calcium and aluminum | Synonyms: chabazite |
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| handbasin | (noun) a basin for washing the hands | Synonyms: lavabo, wash-hand basin, washbasin, washbowl |
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| hypobasidium | (noun) special cell constituting the base of the basidium in various fungi especially of the order Tremellales | - |
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| washbasin | (noun) a basin for washing the hands | Synonyms: handbasin, lavabo, wash-hand basin, washbowl |
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| (noun) a bathroom sink that is permanently installed and connected to a water supply and drainpipe; where you can wash your hands and face | Synonyms: basin, lavatory, washbowl, washstand |