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  • heat island
    heat island
    noun
    an urban area having a higher average temperature than its rural surroundings owing to the greater absorption, retention, and generation of heat by its buildings, pavements, and human activities.
  • heat-island
    heat-island
    noun
    meteorol the mass of air over a large city, characteristically having a slightly higher average temperature than that of the surrounding air

heat island

American  
[heet ahy-luhnd] / ˈhit ˌaɪ lənd /

noun

  1. an urban area having a higher average temperature than its rural surroundings owing to the greater absorption, retention, and generation of heat by its buildings, pavements, and human activities.


heat-island British  

noun

  1. meteorol the mass of air over a large city, characteristically having a slightly higher average temperature than that of the surrounding air

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of heat island

First recorded in 1960–65

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

See Examples For:

And they would add crucial green space to reduce the heat island effect, she says.

From The Wall Street Journal Jun. 24, 2026

Dehydration and heat stroke can occur when temperatures rise, and urban heat island effects can also help to trap pollution leading to poor air quality.

From BBC Jun. 28, 2025

In cities, the trend is compounded by the fact that the built environment absorbs and retains more heat than the rural area around it, a phenomenon known as the urban heat island effect.

From Los Angeles Times Jan. 31, 2025

Ruese also suggested that local leaders improve urban infrastructure so that it reduces heat, and in particular the urban heat island effect.

From Salon Apr. 15, 2024

"And in addition, you'll have this positive impact on the metropolitan-scale heat island effect."

From Science Daily Feb. 12, 2024

And artificial turf is disproportionately installed to replace private lawns and public landscaping in economically disadvantaged communities that already face the greatest consequences of the urban heat-island effect, in which hard surfaces raise local temperatures.

From Los Angeles Times Aug. 5, 2024

But it does not begin to abate the larger heat-island effect created by the six-lane roadway it stands next to.

From Slate May 22, 2023

Gravel or decking beat a big swathe of concrete, which creates run-off issues and adds to the urban heat-island effect by absorbing the sun’s warmth and trapping gases from vehicle exhaust and air-conditioning units.

From Seattle Times Jul. 26, 2022

The main problem driving the so-called "heat-island effect" is tall buildings.

From Salon Aug. 12, 2021

In cities, concrete also adds to the heat-island effect by absorbing the warmth of the sun and trapping gases from car exhausts and air-conditioner units – though it is, at least, better than darker asphalt.

From The Guardian Feb. 25, 2019

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