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Definition of thermal

thermal

/ˈθɜːrməl/
ther · mal

Adverb:thermally
•
Plural:thermals
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thermal Lexical Profile

thermal Game Scores & Validity

• adjective

1

Relating to, caused by, or conserving heat.

Example

"Engineers installed thick thermal insulation in the walls to reduce winter heating costs."


2

Relating to or denoting natural springs of warm or hot mineral water.

Example

"The region is famous for its geothermal activity and relaxing thermal baths."

Synonyms
View all synonyms for thermal

• noun

1

A knitted garment, especially underwear, specially designed with insulating fabric to keep the wearer warm in cold weather (usually used in the plural).

Example

"Make sure to pack plenty of wool socks and thermals for the winter camping trip."


2

An upward current of warm air, used by birds, gliders, and hot-air balloons to gain height.

Example

"The hawk spread its broad wings and circled effortlessly on a rising thermal."

• Rhymes for thermal

Word Origin & Etymology

Borrowed in the mid-18th century from French thermal, ultimately derived from the Ancient Greek word therme, meaning 'heat' or 'feverish warmth'.

Cite this Entry


Wordmom. (2026). Definition of Thermal. In Wordmom Dictionary. Retrieved Nov 5, 2026, from https://wordmom.com/dictionary/thermal
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