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English Words Starting With H

5,990 entries — pick a word to see its definition, pronunciation, and usage.

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Noun Verb Adjective Adverb Plural noun Combining form Verb (transitive)Verb (intransitive)Verb (ambitransitive)

hexachlorophene
nounC2
/ˌhɛksəˈklɔːrəfiːn/A chemical compound used as a disinfectant and antibacterial agent.
hexachord
nounC2+ (Very low frequency, highly specialized)
/ˈhɛksəkɔːd/A series of six musical notes with a pattern of tones and semitones.
hexacosanoic acid
nounExtremely rare
/ˌhɛksəˌkɒsəˈnəʊɪk ˈæsɪd/A long-chain saturated fatty acid with 26 carbon atoms.
hexad
nounVery low
/ˈhɛksad/A group or set of six.
hexadecane
nounC2
/ˌhɛksəˈdɛkeɪn/A saturated hydrocarbon of the alkane series with the chemical formula C₁₆H₃₄.
hexadecanoic acid
nounVery Low
/ˌhɛksəˌdɛkəˈnəʊɪk ˈæsɪd/A saturated fatty acid with 16 carbon atoms, commonly known as palmitic acid.
hexadecimal
adjectivenounC1/C2
/ˌhɛksəˈdɛsɪm(ə)l/A base-16 numeral system using digits 0–9 and letters A–F to represent values ten to fifteen.
hexaemeron
nounExtremely Low / C2
/ˌhɛksəˈiːmərɒn/A treatise or narrative concerning the six days of creation, especially as described in the Book of Genesis.
hexaethyl tetraphosphate
nounVery Low
/ˌhɛksəˈɛθaɪl ˌtɛtrəˈfɒsfeɪt/A specific chemical compound belonging to the organophosphate class.
hexafluoride
nounLow
/ˌhɛksəˈflʊəraɪd/A chemical compound containing six fluorine atoms.
hexagon
nounLow-frequency in everyday conversation; medium-frequency in academic/technical contexts
/ˈhɛksəɡ(ə)n/a plane figure with six straight sides and six angles
hexagram
nounLow
/ˈhɛksəɡræm/A six-pointed star figure formed by extending the sides of a regular hexagon.
hexahedron
nounLow
/ˌhɛksəˈhiːdrən/A solid geometric figure with six plane faces, especially a cube.
hexahydrate
nounVery Low
/ˌhɛksəˈhaɪdreɪt/A chemical compound containing six molecules of water of crystallization per formula unit.
hexahydroaniline
nounVery low
/ˌhɛksəhaɪdrəʊˈænɪliːn/A saturated cyclic amine derived from aniline by adding six hydrogen atoms; specifically, cyclohexylamine.
hexahydrobenzene
nounC2
/ˌhɛksəˌhaɪdrəʊˈbɛnziːn/The fully saturated six-carbon cyclic hydrocarbon; the chemical compound cyclohexane.
hexahydropiridine
nounExtremely Low (Specialist Technical Term)
/ˌhɛksəhaɪdrəʊˈpɪrɪdiːn/A saturated six-membered heterocyclic organic compound containing one nitrogen atom.
hexahydropyrazine
nounC2
/ˌhɛksəˌhaɪdrəʊˈpɪrəziːn/The fully saturated form of pyrazine, a six-membered heterocyclic compound containing two nitrogen atoms opposite each other in the ring.
hexahydrothymol
nounVery Low
/ˌhɛksəhaɪdrə(ʊ)ˈθaɪmɒl/A specific chemical compound related to menthol and thymol, often used as a mild antiseptic and fragrance agent.
hexahydroxycyclohexane
nounVery low frequency (C2/Highly Technical)
/ˌhɛksəhaɪˌdrɒksɪˌsaɪkləʊˈhɛkseɪn/A specific organic chemical compound with the formula C6H6(OH)6, consisting of a six-carbon ring (cyclohexane) with six hydroxy groups (-OH) attached.

Showing 2861–2880 of 5990 words.