| naphazoline | (noun) vasoconstrictor (trade names Privine and Sudafed) used in nasal sprays to treat symptoms of nasal congestion and in eyedrops to treat eye irritation | Synonyms: Privine, Sudafed |
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| naphtha | (noun) any of various volatile flammable liquid hydrocarbon mixtures; used chiefly as solvents | - |
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| naphthalene | (noun) a white crystalline strong-smelling hydrocarbon made from coal tar or petroleum and used in organic synthesis and as a fumigant in mothballs | - |
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| naphthol | (noun) either of two phenols derived from naphthalene | - |
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| naphthoquinone | (noun) a fat-soluble vitamin that helps in the clotting of blood | Synonyms: antihemorrhagic factor, vitamin K |
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