From PIE *gwher- (hot) — the same root as Greek 'thermos,' separated by two sound shifts but identical.
Of or at a fairly high temperature; having or producing a comfortable degree of heat; to make or become warm.
From Old English 'wearm' (warm), from Proto-Germanic *warmaz (warm), from PIE *gʷʰer- (hot, warm). This is one of the most stable and well-attested roots in Indo-European, with cognates in nearly every branch. The same root produced Greek 'thermos' (hot), Latin 'formus' (warm), and Sanskrit