thermal
adjective/ˈθɜrməl/
Frequency rank: #4,031 of 20,003 in the WORDED list (wordfreq data)
Meaning
relating to heat, or designed to retain body heat.

Example sentence
The hikers wore thermal underwear to stay warm during the cold mountain trek.
Synonyms & related words
More words in ranks 4,001–4,100
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