| cyproheptadine | (noun) an antihistamine (trade name Periactin) used to treat some allergic reactions | Synonyms: Periactin |
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| heptad | (noun) the cardinal number that is the sum of six and one | Synonyms: 7, septenary, septet, seven, sevener, VII |
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| heptagon | (noun) a seven-sided polygon | - |
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| heptane | (noun) a colorless volatile highly flammable liquid obtained from petroleum and used as an anesthetic or a solvent or in determining octane ratings | - |
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| heptasyllable | (noun) a word or line of verse of seven syllables. | - |
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| heptose | (noun) a monosaccharide with seven carbon atoms. | - |
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| ketoheptose | (noun) A seven-carbon sugar possessing a ketone group. | - |
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