dʰeh₁-rm-

“that which is heated, warm”

Widely acceptedtemperaturequality

therm, thermal, thermos

Extended form yielding Greek thermos, English therm, thermal, thermos, thermometer.‌‍‌‍‌‍‍‍‍‍‍‍‍‌‌‌‍‍‍‍‍‍‍‍‌‌‍‍‍‍‌‍

bʰerǵ-eyo-“to keep brightening, shining”bʰerw-mn̥-₂“boiling, fermenting mass”deru-“tree, wood, to be firm”dʰeh₁-ḱ-ul-“easy to make, manageable”dʰerǵʰ-mn̥-“firmness, hardness, endurance”gʰeHd-“to unite, join, be fitting”gʰer-mn̥-₂“warmth, heat (nominal)”gʰerH-mn̥“a warm thing, heated substance”