thermal

nouns

rising current of warm air
is a type of (narrower)
air moving (sometimes with considerable force) from an area of high pressure to an area of low pressure
"trees bent under the fierce winds"; "when there is no wind, row"; "the radioactivity was being swept upwards by the air current and out into the atmosphere"

adjectives

relating to or associated with heat
"thermal movements of molecules"; "thermal capacity"; "thermic energy"; "the caloric effect of sunlight"
antonym
pertains to
of or relating to a hot spring
"thermal water"
pertains to
caused by or designed to retain heat
"a thermal burn"; "thermal underwear"
is similar to
used of physical heat; having a high or higher than desirable temperature or giving off heat or feeling or causing a sensation of heat or burning
"hot stove"; "hot water"; "a hot August day"; "a hot stuffy room"; "she's hot and tired"; "a hot forehead"