1. (v.i.)boil to change from a liquid to a gaseous state, typically as a result of heat, producing bubbles of gas that rise to the surface of the liquid.
2. (noun)Boil 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
3. Boil 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
4. Boil to be agitated likeboiling water, by any other cause than heat; to bubble; to effervesce; as, the boiling waves
5. Boil to pass from a liquid to an aeriform state or vapor when heated; as, the water boils away
6. Boil to be moved or excited with passion; to be hot or fervid; as, his blood boils with anger
7. Boil to be in boiling water, as in cooking; as, the potatoes are boiling
8. (verb)Boil to heat to the boiling point, or so as to cause ebullition; as, to boil water
9. (verb)Boil to form, or separate, by boiling or evaporation; as, to boil sugar or salt
10. (verb)Boil to subject to the action of heat in a boilingliquid so as to produce some specific effect, as cooking, cleansing, etc.; as, to boil meat; to boilclothes