| Word | Definitions | Synonyms |
|---|---|---|
| heptad | (noun) the cardinal number that is the sum of six and one | Synonyms: 7, septenary, septet, seven, sevener, VII |
| heptagon | (noun) a seven-sided polygon | - |
| heptane | (noun) a colorless volatile highly flammable liquid obtained from petroleum and used as an anesthetic or a solvent or in determining octane ratings | - |
| heptasyllable | (noun) a word or line of verse of seven syllables. | - |
| heptose | (noun) a monosaccharide with seven carbon atoms. | - |