infrigidate
To make (something) cold; to chill.
obsolete, transitive
[…] I vvas not deceived in expecting, that the dry ſalt, remaining in the pipkins, being rediſſolved in a due proportion of vvater, vvould very conſiderably infrigidate it; […]
Where it comes from
From Latin infrigidatus, past participle of infrigidare (“to chill”). See in- and frigid.
Adapted from the Wiktionary entry infrigidate (CC BY-SA 4.0).