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.-to be agitated like boiling water, by any other cause than heat; to bubble; to effervesce; as, the boiling waves.-to pass from a liquid to an aeriform state or vapor when heated; as, the water boils away.-to be moved or excited with passion; to be hot or fervid; as, his blood boils with anger.-to be in boiling water, as in cooking; as, the potatoes are boiling.-to heat to the boiling point, or so as to cause ebullition; as, to boil water.-to form, or separate, by boiling or evaporation; as, to boil sugar or salt.-to subject to the action of heat in a boiling liquid so as to produce some specific effect, as cooking, cleansing, etc.; as, to boil meat; to boil clothes.-to steep or soak in warm water.-act or state of boiling.-a hard, painful, inflamed tumor, which, on suppuration, discharges pus, mixed with blood, and discloses a small fibrous mass of dead tissue, called the core.