| columbine | (noun) a plant of the genus Aquilegia having irregular showy spurred flowers; north temperate regions especially mountains | Synonyms: aquilege, aquilegia |
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| columbite | (noun) a black mineral that is an ore of niobium and tantalum | Synonyms: niobite |
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| columbium | (noun) a former name for niobium | - |
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| plumbing | (noun) measuring the depths of the oceans | Synonyms: bathymetry |
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| (noun) the occupation of a plumber (installing and repairing pipes and fixtures for water or gas or sewage in a building) | Synonyms: plumbery |
| (noun) utility consisting of the pipes and fixtures for the distribution of water or gas in a building and for the disposal of sewage | Synonyms: plumbing system |
| plumbism | (noun) toxic condition produced by the absorption of excessive lead into the system | Synonyms: lead poisoning, saturnism |
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| umbilical | (noun) membranous duct connecting the fetus with the placenta | Synonyms: umbilical cord |
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| umbilicus | (noun) a scar where the umbilical cord was attached | Synonyms: belly button, bellybutton, navel, omphalos, omphalus |
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