Heat Definition

heated, heating, heats
A form of energy associated with the motion of atoms or molecules and capable of being transmitted through solid and fluid media by conduction, through fluid media by convection, and through empty space by radiation.
American Heritage
The quality of being hot; hotness: in physics, heat is considered a form of energy existing as the result of the random motion of molecules and is the form of energy that is transferred between bodies as a result of their temperature difference.
Webster's New World
Much hotness; great warmth.
Stifling heat.
Webster's New World
Webster's New World
An abnormally high bodily temperature, as from a fever.
American Heritage Medicine
heated, heating, heats
To make warm or hot.
American Heritage
To excite the feelings of; inflame.
American Heritage
To increase the molecular or kinetic energy of (an object).
American Heritage
To make or become excited; inflame or become inflamed.
Webster's New World
To become warm or hot.
American Heritage

(military) High Explosive Anti-Tank — antitank munition using a high explosive shaped charge to breach armour.


Origin of Heat

  • From Middle English hete, from Old English hǣte, hǣtu (“heat, warmth; fervor, ardor”), from Proto-Germanic *haitį̄ (“heat”), from Proto-Indo-European *kÀit- (“heat; hot”). Cognate with Scots hete (“heat”), North Frisian hiet (“heat”), Old High German heizī (“heat”). Related also to Dutch hitte (“heat”), German Hitze (“heat”), Swedish hetta (“heat”), Icelandic hita (“heat”).

    From Wiktionary

  • From Middle English heten, from Old English hǣtan (“to heat; become hot”), from Proto-Germanic *haitijaną (“to heat, make hot”).

    From Wiktionary

  • Middle English hete from Old English hǣtu kai- in Indo-European roots

    From American Heritage Dictionary of the English Language, 5th Edition

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