Pronunciation: (boi'ling),[key] —adj. 1. having reached the boiling point; steaming or bubbling up under the action of heat: boiling water. 2. fiercely churning or swirling: the boiling seas. 3. (of anger, rage, etc.) intense; fierce; heated.
—adv. to an extreme extent; very: August is usually boiling hot; boiling mad.