Warmth

wiktionary

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From Middle English warmth, warmeth, wermþe, from Old English *wiermþu(“warmth”), from Proto-West Germanic *warmiþu(“warmness; warmth”), corresponding to warm +‎ -th. Cognate with Saterland Frisian Waarmte(“warmth”), West Frisian waarmte(“warmth”), Dutch warmte(“warmth”), German Low German Warmte, Warmt(“warmth”).

etymonline

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warmth (n.)

late 12c., wearmth, Proto-Germanic *warmitho- (source also of Middle Low German wermede, Dutch warmte), from *warmo- (see warm (adj.); also see -th (2)).