Heat or warmth applied or developed in opposition to or to counteract another source of heat or cold.
From 'counter-' (opposing) and 'warmth,' from Old English 'wearm.' Scientific terminology adopted this to describe thermal compensation mechanisms.
Your body generates counterwarmth automatically when you're cold—your muscles shiver to produce heat opposing the loss of temperature, and without this automatic response, hypothermia would kill humans quickly.
Complete word intelligence in one call. Free tier — 50 lookups/day.