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English Words Starting With H
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- heliosphere/ˈhiː.li.əʊ.sfɪər/The vast, bubble-like region of space dominated by the solar wind and the Sun's magnetic field.nounC2
- heliostat/ˈhiː.li.ə(ʊ).stæt/A device that uses a mirror to reflect sunlight continuously onto a fixed target, typically by rotating automatically to track the sun's movement.nounRare
- heliotaxis/ˌhiːlɪə(ʊ)ˈtaksɪs/The movement of an organism toward or away from sunlight.nounVery low (C2+)
- heliotherapy/ˌhiː.li.əʊˈθer.ə.pi/The treatment of disease by exposure to sunlight.nounLow
- heliotrope/ˈhiː.li.ə.trəʊp/A plant with fragrant purple flowers that historically turn towards the sun.nounC2
- heliotropin/ˌhiːlɪəʊˈtrəʊpɪn/A crystalline compound derived from vanilla beans, used as a fragrance and flavoring agent (also called piperonal).nounVery Low (technical/specialist)
- heliotropism/ˌhiːliˈɒtrəpɪz(ə)m/The growth or movement of an organism, especially a plant, in response to the direction of sunlight.nounC2
- heliotype/ˈhiːlɪə(ʊ)taɪp/A printing process where an image is transferred from a gelatin film to a metal plate, used primarily in the 19th century for photographic reproduction.nounRare
- heliozoan/ˌhiːlɪə(ʊ)ˈzəʊən/A predominantly freshwater protozoan of the order Heliozoa, characterized by a spherical body and long, radiating, thread-like pseudopodia.adjectivenounC2
- helipad/ˈhel.i.pæd/A designated, often marked, area where helicopters can land and take off.nounC1
- heliport/ˈhel.ɪ.pɔːt/A designated area, often including a platform or small airport, for helicopters to take off and land.nounLow
- heliskiing/ˈhɛlɪˌskiːɪŋ/A form of skiing where a helicopter transports skiers to remote, otherwise inaccessible mountain terrain.nounC2
- helistop/ˈhɛlɪstɒp/A designated area for helicopters to land and take off, typically smaller and less equipped than a heliport.nounLow
- helium/ˈhiːliəm/A chemical element (symbol He, atomic number 2), a very light, colourless, odourless, non-toxic, inert gas that is the second most abundant element in the universe.nounC2
- helium flash/ˈhiːliəm flaʃ/A sudden and explosive onset of helium fusion in the core of a low-mass star, such as the Sun, at the end of its red giant phase.nounVery Low (C2)
- helium i/ˈhiːliəm wʌn/The neutral, un-ionized state of a helium atom; the most common, stable form of helium found naturally on Earth.nounC2
- helium ii/ˈhiːliəm ˌtuː/A superfluid phase of liquid helium that occurs below 2.17 Kelvin, exhibiting zero viscosity and high thermal conductivity.nounVery Low
- helix/ˈhiːlɪks/A three-dimensional curve that coils around a central axis, resembling the shape of a spring, spiral staircase, or the structure of DNA.nounC1
- hell/hɛl/In Christian theology and common usage, the place of eternal punishment for the wicked after death; more generally, a state or place of extreme suffering, misery, or evil.interjectionnounB1
- hell gate/ˌhel ˈɡeɪt/A dangerous passage or entrance, often referring to a specific treacherous strait or waterway (e.g., Hell Gate in New York), or metaphorically to any extremely perilous or infernal entry point.nounRare
Showing 2161–2180 of 5990 words.