A shimmering atmospheric disturbance caused by currents of warm air between the observer and the object observed.

(physics) The state of a thermodynamic system having reached a maximum entropy; temperature is uniform throughout, and no energy is available to do work.

(thermodynamics) Any device which converts heat energy into mechanical work, by moving heat from a source to a sink.

(physics) The capability of a system to absorb heat energy; the amount of thermal energy required to raise the temperature of a system by one temperature unit without any change of phase.

(obsolete) sunstroke

Any area, populated or not, which is consistently hotter than the surrounding area. / Ellipsis of urban heat island..

(biology) The response of an organism to a rapid rise in temperature

Being a ready meal.

plural of specific heat

plural of latent heat