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BOIL, verb intransitive [Latin bullio, bulla, a bubble.]

1. To swell, heave, or be agitated by the action of heat; to bubble; to rise in bubbles; as, the water boils. In a chimical sense, to pass from a liquid to an aeriform state or vapor, with a bubbling motion.

2. To be agitated by any other cause than heat; as, the boiling waves which roll and foam.

3. To be hot or fervid; to swell by native heat, vigor or irritation; as the boiling blood of youth; his blood boils with anger.

4. To be in boiling water; to suffer boiling heat in water or other liquid, for cookery or other purpose.

5. To bubble; to effervesce; as a mixture of acid and alkali.

To boil away, to evaporate by boiling.

To boil over, is to run over the top of a vessel, as liquor when thrown into violent agitation by heat or other cause of effervescence.

BOIL, verb transitive To dress or cook in boiling water; to seethe; to extract the juice or quality of any thing by boiling.

1. To prepare for some use in boiling liquor; as, to boil silk, thread or cloth. To form by boiling and evaporation. This word is applied to a variety of processes for different purposes; as, to boil salt, or sugar, etc. In general, boiling is a violent agitation, occasioned by heat; to boil a liquor is to subject it to heat till it bubbles, and to boil any solid substance is to subject it to heat in a boiling liquid.

BOIL, noun A tumor upon the flesh, accompanied with soreness and inflammation; a sore angry swelling.