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[heet] /hit/
the state of a body perceived as having or generating a relatively high degree of warmth.
the condition or quality of being hot:
the heat of an oven.
the degree of hotness; temperature:
moderate heat.
the sensation of warmth or hotness:
unpleasant heat.
a bodily temperature higher than normal:
the heat of a fever; the feeling of heat caused by physical exertion.
added or external energy that causes a rise in temperature, expansion, evaporation, or other physical change.
Physics. a nonmechanical energy transfer with reference to a temperature difference between a system and its surroundings or between two parts of the same system. Symbol: Q.
a hot condition of the atmosphere or physical environment; hot season or weather.
a period of hot weather.
a sharp, pungent flavor, as that produced by strong spices.
warmth or intensity of feeling; vehemence; passion:
He spoke with much heat and at great length.
maximum intensity in an activity, condition, etc.; the height of any action, situation, or the like:
the heat of battle; the heat of passion.
extreme pressure, as of events, resulting in tension or strain:
In the heat of his hasty departure he forgot his keys.
a single intense effort; a sustained, concentrated, and continuous operation:
The painting was finished at a heat.
Slang. intensified pressure, especially in a police investigation.
Slang. the police.
Slang. armed protection, especially a pistol, revolver, or other firearm:
All guards carry some heat.
  1. a single course in or division of a race or other contest.
  2. a race or other contest in which competitors attempt to qualify for entry in the final race or contest.
  1. a single operation of heating, as of metal in a furnace, in the treating and melting of metals.
  2. a quantity of metal produced by such an operation.
  1. sexual receptiveness in animals, especially females.
  2. the period or duration of such receptiveness:
    to be in heat.
verb (used with object)
to make hot or warm (often followed by up).
to excite emotionally; inflame or rouse with passion.
verb (used without object)
to become hot or warm (often followed by up).
to become excited emotionally.
Verb phrases
heat up, to increase or become more active or intense:
Business competition will heat up toward the end of the year.
Origin of heat
before 900; Middle English hete, Old English hǣtu; akin to German Hitze; see hot
Related forms
heatable, adjective
heatful, adjective
heatless, adjective
heatlike, adjective
reheat, verb
reheatable, adjective
self-heating, adjective
underheat, verb (used with object)
unheatable, adjective
2. hotness, warmth. 3. caloricity. 11. ardor, fervor, zeal, flush, fever, excitement, impetuosity. 22. stimulate, warm, stir, animate.
1. coolness. 11. indifference. 21. cool. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for heatless
Contemporary Examples
Historical Examples
  • To the 243 wheatless, meatless, sweetless days there were added the heatless months.

    The Cup of Fury Rupert Hughes
  • There the shivering chill of midnight made a strong contrast to the burning, heatless glitter of midday.

    My Attainment of the Pole Frederick A. Cook
  • Overhead the dim red ember of Phi Coronis, Wolf's old and dying sun, gave out a pale and heatless light.

    The Door Through Space Marion Zimmer Bradley
  • Rubber-clad soldiers moved about in the blue glow of the globes sending down their heatless light from the ceiling.

  • Such a heatless condition has been approached, but as yet not quite attained, in laboratory experiments.

  • Yet even then, according to the current hypothesis, the heatless molecule will still be a thing instinct with life.

  • John watched the ash in Hatch's cigar turning from a glowing red to a heatless gray.

    Spring Street James H. Richardson
  • What wonderful possibilities are in store for the inventor who can make a heatless light!

    Electricity for Boys J. S. Zerbe
British Dictionary definitions for heatless


  1. the energy transferred as a result of a difference in temperature
  2. the random kinetic energy of the atoms, molecules, or ions in a substance or body
related adjectives thermal calorific
the sensation caused in the body by heat energy; warmth
the state or quality of being hot
hot weather: the heat of summer
intensity of feeling; passion: the heat of rage
pressure: the political heat on the government over the economy
the most intense or active part: the heat of the battle
a period or condition of sexual excitement in female mammals that occurs at oestrus
  1. a preliminary eliminating contest in a competition
  2. a single section of a contest
(slang) police activity after a crime: the heat is off
(mainly US, slang) criticism or abuse: he took a lot of heat for that mistake
in the heat of the moment, without pausing to think
on heat, in heat
  1. Also in season. (of some female mammals) sexually receptive
  2. in a state of sexual excitement
(slang) the heat, the police
(informal) turn up the heat, turn on the heat, to increase the intensity of activity, coercion, etc
to make or become hot or warm
to make or become excited or intense
Derived Forms
heatless, adjective
Word Origin
Old English hǣtu; related to hāthot, Old Frisian hēte heat, Old High German heizī
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
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Word Origin and History for heatless



Old English hætan "to heat; to become hot," from Proto-Germanic *haitijanam (see heat (n.)). Related: Heated (with many variants in Middle English); heating. Cf. Middle Dutch heeten, Dutch heten, German heizen "to heat."



Old English hætu, hæto "heat, warmth; fervor ardor," from Proto-Germanic *haiti- "heat" (cf. Old Saxon hittia, Old Norse hiti, Old Frisian hete, German hitze "heat," Gothic heito "fever"), from PIE *kaid-, from root *kai- "heat." The same root is the source of Old English hat "hot" and hæða "hot weather" (see hot).

Meaning "a single course in a race," especially a horse race, is from 1660s, perhaps from earlier figurative sense of "violent action; a single intense effort" (late 14c.), or meaning "run given to a horse to prepare for a race" (1570s). This later expanded to "division of a race or contest when there are too many contestants to run at once," the winners of each heat then competing in a final race. Meaning "sexual excitement in animals" is from 1768. Meaning "trouble with the police" attested by 1920. Heat wave "period of excessive hot weather" first attested 1890; earlier in reference to solar cycles.

Online Etymology Dictionary, © 2010 Douglas Harper
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heatless in Medicine

heat (hēt)

  1. 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.

  2. The sensation or perception of such energy as warmth or hotness.

  3. An abnormally high bodily temperature, as from a fever.

  4. Estrus.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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heatless in Science
  1. Internal energy that is transferred to a physical system from outside the system because of a difference in temperature and does not result in work done by the system on its surroundings. Absorption of energy by a system as heat takes the form of increased kinetic energy of its molecules, thus resulting in an increase in temperature of the system. Heat is transferred from one system to another in the direction of higher to lower temperature. See also thermodynamics. See Note at temperature.

  2. See estrus.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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heatless in Culture

heat definition

In physics, a form of energy associated with the movement of atoms and molecules in any material. The higher the temperature of a material, the faster the atoms are moving, and hence the greater the amount of energy present as heat. (See infrared radiation.)

The New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Slang definitions & phrases for heatless



  1. Pursuit, prosecution, and other sorts of involvement with the law: types of cash mark which do not involve federal heat (1928+ Underworld)
  2. (also heater) A good fastball (1980s+ Baseball)
  3. Any sort of trouble, pressure, or recrimination, esp the angry complaining of irritated persons; flak, static: We better expect heat when this report gets out (late 1920s+)
  4. (also heater) A firearm, usually a pistol: I was packing about as much heat as you find in an icicle without a gun (late 1920s+)
  5. A round in boxing, inning in baseball, etc •Heat, ''a horse race,'' is found by 1663 (1940s+ Sports)

Related Terms

bitch in heat, dead heat, give someone heat, pack heat

The Dictionary of American Slang, Fourth Edition by Barbara Ann Kipfer, PhD. and Robert L. Chapman, Ph.D.
Copyright (C) 2007 by HarperCollins Publishers.
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Idioms and Phrases with heatless


In addition to the idioms beginning with heat
The American Heritage® Idioms Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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