1. To be agitated, or tumultuously moved, as a liquid by the generation and rising of bubbles of steam (or vapor), or of currents produced by heating it to the boiling point; to be in a state of ebullition; as, the water boils. 2. To be agitated like boiling water, by any other cause than heat; to bubble; to effervesce; as, the boiling waves. He maketh the deep to boi...