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.

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

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

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

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.

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

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 sugarIn 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.

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