| initial heat | The first burst of heat produced after the beginning of a muscle twitch, described by A. V. Hill. (05 Mar 2000) |
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| innate heat | In ancient Greek medicine, the heat of the heart sustained by the pneuma and distributed by the arteries throughout the body. (05 Mar 2000) |
| unit of heat | Calorie (gram calorie; kilocalorie) Synonym: British thermal unit. Synonym: joule. (05 Mar 2000) |
| latent heat | The amount of heat that a substance may absorb without an increase in temperature, as in conversion from solid to liquid state (ice to water at 0캜), or from liquid to gaseous state (water to steam at 100캜). Compare: sensible heat. (05 Mar 2000) |