Meaning of THERMAL in English

THERMAL

I. ther ‧ mal 1 /ˈθɜːm ə l $ ˈθɜːr-/ BrE AmE adjective [only before noun]

[ Date: 1700-1800 ; Language: Greek ; Origin: therme ; ⇨ ↑ therm ]

1 . relating to or caused by heat:

thermal energy

2 . thermal clothing is made from special material to keep you warm in very cold weather:

thermal underwear

3 . thermal water is heated naturally under the earth:

thermal springs

II. thermal 2 BrE AmE noun

1 . [countable] a rising current of warm air used by birds

2 . thermals [plural] British English informal special warm clothing, especially underwear, worn under your other clothes

Longman Dictionary of Contemporary English.      Longman - Словарь современного английского языка.