heat island
noun
an urban area having higher average temperature than its rural surroundings owing to the greater absorption, retention, and generation of heat by its buildings, pavements, and human activities.
Origin of heat island
First recorded in 1960–65
Words nearby heat island
British Dictionary definitions for 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