noun

• (uncountable, countable) The process of changing the state of a substance from liquid to gas by heating it to its boiling point.
• (uncountable, countable) The cooking (of food) or cleaning (of an object) by immersing it in liquid (usually water) that is boiling.
• (countable, figurative) A turmoil; a disturbance like that of bubbling water.
• (uncountable, figurative) An animation style with constantly changing wavy outlines, giving a shimmering or wobbling appearance.

adj

• (informal, hyperbolic) Of a thing: extremely hot or active.
  "The radiator is boiling – I’m going to turn it down a bit."
• (informal, hyperbolic) Of a person: feeling uncomfortably hot.
  "I’m boiling – can’t we open a window?"
• (informal, hyperbolic) Of the weather: very hot.
  "It’s boiling out today!"

adv

• (of adjectives associated with heat) Extremely
  "He was boiling mad."