Merriam-Webster's Collegiate® Dictionary, 11th Edition
BOIL
I. verb
Etymology: Middle English, from Anglo-French buillir, boillir, from Latin bullire to bubble, from bulla bubble
Date: 13th century
intransitive verb
1. to come to the boiling point, to generate bubbles of vapor when heated, to cook in boiling water, to become agitated ; seethe , to be moved, excited, or stirred up ,
4. to rush headlong, to burst forth ; erupt , to undergo the action of a boiling liquid, transitive verb to subject to the action of a boiling liquid, to heat to the boiling point, to form or separate (as sugar or salt) by boiling, boilable adjective
II. noun
Etymology: Middle English, alteration of bile, from Old English bȳl; akin to Old High German pūlla bladder
Date: 15th century
a localized swelling and inflammation of the skin resulting from infection of a hair follicle and adjacent tissue, having a hard central core, and forming pus,
III. noun
Date: 15th century
the act or state of boiling, a swirling upheaval (as of water), a boiled dish of seafood, vegetables, and seasonings