An Etymological Dictionary of the German Language/Annotated/warm

by Friedrich Kluge

warm, adjective, ‘warm,’ from the equivalent Middle High German and Old High German warm; corresponding to Old Saxon, Dutch and English warm, Gothic *warms (compare warmjan, ‘to warm’). A common Teutonic adjective based on the Aryan root war, ‘to be hot.’ Compare Old Slovenian varŭ, ‘heat,’ with vrěti, ‘to boil, be hot,’ vrŭlŭ, ‘passionate’; Lithuanian vìrti, ‘to boil.’ The Teutonic cognates have, with less reason, been compared with Sanscrit gharmá, ‘heat of fire, glare of the sun,’ and Greek θερμός, Latin formus, ‘warm.’