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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)

helicospore
nounTechnical / Specialist
/ˈhɛlɪkə(ʊ)ˌspɔː/A spirally coiled or twisted spore, typically found in some fungi and algae.
heliculture
nounVery Low
/ˈhɛlɪˌkʌltʃə/The rearing or breeding of snails for food or other purposes.
helideck
nounC2
/ˈhel.i.dek/A designated platform on a ship or offshore structure, specifically built for helicopters to land on and take off from.
heligoland
nounVery Low
/ˈhɛlɪɡəʊˌlænd/A proper noun referring to the island of Heligoland, a small archipelago in the North Sea.
helio
combining-formnounLow
/ˈhiː.lɪ.əʊ/a combining form meaning "sun" (from Greek helios), used in the formation of compound words.
heliocentric parallax
nounVery Low
/ˌhiː.li.əʊˈsen.trɪk ˈpær.ə.læks/The apparent shift in position of a celestial object, primarily stars, when viewed from two different points in Earth's orbit around the Sun, used to calculate astronomical distances.
heliocentrism
nounC2
/ˌhiː.li.əʊˈsen.trɪ.zəm/The astronomical model in which the Earth and planets revolve around the Sun at the center of the Solar System.
heliochrome
nounVery Low / Archaic
/ˈhiːlɪə(ʊ)krəʊm/A photograph in natural colours.
heliodor
nounVery Low
/ˈhiːlɪədɔː/A yellow or golden-green variety of the mineral beryl, colored by iron impurities.
heliogabalus
nounVery Rare
/ˌhiːlɪə(ʊ)ˈɡæbələs/A Roman emperor from 218 to 222 AD, known for his extreme decadence, debauchery, and erratic rule.
heliogram
nounRare / Obsolete
/ˈhiːlɪə(ʊ)ɡram/A message sent by reflecting sunlight with a heliograph (a mirror device).
heliograph
nounverb-ambitransitiveC2
/ˈhiː.li.ə.ɡrɑːf/A signalling device that uses flashes of sunlight reflected by a mirror.
heliogravure
nounVery Rare
/ˌhiːlɪəʊɡrəˈvjʊə/A photomechanical printing process, also known as photogravure, in which an image is etched into a metal plate from a photographic negative.
heliolatry
nounC2
/ˌhiːlɪˈɒlətri/The worship of the sun.
heliometer
nounRare (C2+)
/ˌhiːlɪˈɒmɪtə/A telescopic instrument for measuring small angular distances between celestial objects, notably the sun or stars.
heliopause
nounC2
/ˈhiː.li.ə.pɔːz/The theoretical boundary in space where the Sun's solar wind is stopped by the interstellar medium.
heliophyte
nounC2
/ˈhiːliəʊfaɪt/A plant that grows best in full sunlight or requires a high degree of light for optimal growth.
heliopolis
nounVery Low
/ˌhiːliˈɒpəlɪs/A place name meaning "City of the Sun"; originally the ancient Egyptian city of Iunu.
helios
nounC2
/ˈhiːlɪɒs/The Greek god of the sun, personified as a charioteer driving the sun across the sky.
helioscope
nounC2
/ˈhiː.li.əˌskəʊp/An optical instrument, typically a telescope, used for observing the Sun safely.

Showing 2141–2160 of 5990 words.