| hexachlorophene | (noun) antibacterial substance that is a water-soluble powder used in antiseptic soaps and toothpaste | - |
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| hexad | (noun) the cardinal number that is the sum of five and one | Synonyms: 6, Captain Hicks, half a dozen, sestet, sextet, sextuplet, sise, six, sixer, VI |
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| hexadecimal | (adjective) of or pertaining to a number system having 16 as its base | Synonyms: hex |
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| hexagon | (noun) a six-sided polygon | - |
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| hexagonal | (adjective) having six sides or divided into hexagons | Synonyms: hexangular |
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| hexagram | (noun) a regular polygon formed by extending each of the sides of a regular hexagon to form two equilateral triangles | - |
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| hexahedron | (noun) any polyhedron having six plane faces | - |
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| hexakosioihexekontahexaphobia | (noun) fear of magic properties of the number 666 | - |
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| hexameter | (noun) a verse line having six metrical feet | - |
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| hexane | (noun) a colorless flammable liquid alkane derived from petroleum and used as a solvent | - |
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| hexangular | (adjective) having six sides or divided into hexagons | Synonyms: hexagonal |
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| hexapod | (noun) an animal having six feet | - |
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