refrigerant

A substance used in a heat cycle that undergoes a phase change between gas and liquid to allow the cooling, as in refrigerators, air conditioners, etc.

That which makes cool or cold, such as a medicine for allaying the symptoms of fever.

1783, Hugh Blair, Lectures on Rhetoric and Belles Lettres, Dublin: Whitestone et al., Volume 2, Lecture 32, p. 403, […] never give warning that you are about to be pathetic; and call upon your hearers, as is sometimes done, to follow you in the attempt. This almost never fails to prove a refrigerant to passion.

[…] taking a blue and white soda-powder, [she] mingled the same in water, and encouraged me to drink the result. It might be a specific for seasickness, but it was not for home-sickness. The fiz was a mockery, and the saline refrigerant struck a colder chill to my despondent heart.

That cools or freezes; providing relief from heat or fever.

1627, Francis Bacon, Sylua Syluarum: or A Naturall Historie in Ten Centuries, London: William Lee, VIII. Century, p. 204, This Experiment may be transferred vnto the Cure of Gangrenes, either Comming of themselues, or induced by too much Applying of Opiates: Wherein you must beware of Dry Heat, and resort to Things that are Refrigerant, with an Inward Warmth, and Vertue of Cherishing.

Here on a bank, refrigerant seat, Screen’d from the Sun’s o’ercoming heat, Some stretch’d at ease the hours employ, In Bacchus’s unbounded joy,