English Words Starting With H

• heartthrob

  nounC1
  /ˈhɑːt.θrɒb/A person, typically a man, who is considered very physically attractive and causes feelings of romantic excitement, especially a famous actor or singer.
• heartwood

  nounLow
  /ˈhɑːtwʊd/The dense, inactive inner wood of a tree, which no longer conducts sap and provides structural support.
• heartworm

  nounLow
  /ˈhɑːt.wɜːm/A parasitic nematode (Dirofilaria immitis) that lives in the heart and pulmonary arteries of dogs and other mammals, causing serious disease.
• hearty

  adjectivenounB2
  /ˈhɑːti/Showing or expressing strong, sincere, and warm feelings; full of vigor and enthusiasm.
• heat

  nounverbverb-intransitiveverb-transitiveA2
  /hiːt/The quality of being hot; high temperature.
• heat barrier

  nounC2
  /ˈhiːt ˌbæ.ri.ə(r)/The maximum speed at which an object can travel through the atmosphere before friction causes excessive heating.
• heat capacity

  nounC1/C2 (Technical)
  /ˈhiːt kəˌpæs.ə.ti/The amount of heat required to raise the temperature of a given mass of a substance by one degree Celsius (or Kelvin).
• heat content

  nounC2 (very low frequency in general English; specialized term)
  /ˈhiːt ˌkɒn.tɛnt/The total thermal energy contained within a given mass of a substance at a specific temperature and pressure; the sum of its internal energy.
• heat cramp

  nounLow frequency / Technical
  /ˈhiːt ˌkræmp/A painful, involuntary muscle contraction, typically in the legs or abdomen, caused by prolonged exertion in a hot environment and loss of fluids and salts through sweating.
• heat death

  nounC2
  /ˈhiːt ˌdɛθ/A state of the universe in which all energy is evenly distributed and no thermodynamic work is possible.
• heat devil

  nounLow
  /ˈhiːt ˌdev.əl/A visible shimmering or dancing distortion in the air, caused by the refraction of light through layers of hot air of varying density near a heated surface.
• heat dome

  nounMedium-Low (common in weather/climate discourse)
  /ˈhiːt ˌdəʊm/A weather phenomenon where a persistent high-pressure system traps a mass of hot air over a region for an extended period.
• heat engine

  nounLow
  /ˈhiːt ˌen.dʒɪn/A system or device that converts thermal energy (heat) into mechanical work.
• heat equation

  nounRare
  /hiːt ɪˈkweɪʒ(ə)n/A specific mathematical equation that describes how temperature diffuses or spreads through a given region over time.
• heat event

  nounIntermediate (B2-C1)
  /ˈhiːt ɪˌvɛnt/A period of abnormally and uncomfortably hot weather.
• heat exchanger

  nounC1/C2 (Low-frequency technical term, high within engineering and industrial contexts)
  /ˈhiːt ɪksˌtʃeɪn.dʒə/A device or system designed to transfer heat efficiently from one fluid (liquid or gas) to another without mixing them.
• heat exhaustion

  nounB2
  /ˈhiːt ɪɡˌzɔːs.tʃən/A physical condition caused by exposure to high temperatures, characterized by heavy sweating, weakness, dizziness, nausea, and pale, clammy skin.
• heat gun

  nounB2
  /ˈhiːt ˌɡʌn/A handheld electrical tool that emits a stream of very hot air, used for tasks like stripping paint, thawing pipes, or shrinking plastic.
• heat index

  nounLow (specialized/seasonal)
  /ˈhiːt ˌɪn.deks/A calculated value that combines air temperature and relative humidity to estimate how hot it feels to the human body.
• heat island

  nounC1-C2
  /ˈhiːt ˌaɪ.lənd/A metropolitan area significantly warmer than its surrounding rural areas due to human activities.

Showing 1841–1860 of 5990 words.