An Etymological Dictionary of the German Language/warm

by Friedrich Kluge

warm, adj., ‘warm,’ from the equiv. MidHG. and OHG. warm; corresponding to OSax., Du. and E. warm, Goth. *warms (comp. warmjan, ‘to warm’). A common Teut. adj. based on the Aryan root war, ‘to be hot.’ Comp. OSlov. varŭ, ‘heat,’ with vrěti, ‘to boil, be hot,’ vrŭlŭ, ‘passionate’; Lith. vìrti, ‘to boil.’ The Teut. cognates have, with less reason, been compared with Sans. gharmá, ‘heat of fire, glare of the sun,’ and Gr. θερμός, Lat. formus, ‘warm.’