having reached the boiling point; steaming or bubbling up under the action of heat: boiling water.
fiercely churning or swirling: the boiling seas.
(of anger, rage, etc.) intense; fierce; heated.
to an extreme extent; very: August is usually boiling hot; boiling mad.

1250–1300; Middle English. See boil1, -ing2

boilingly, adverb
half-boiling, adjective
nonboiling, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
boiling (ˈbɔɪlɪŋ)
adj, —adv
1.  very warm: a boiling hot day
2.  slang the whole boiling the whole lot

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

early 13c., from O.Fr. bolir "boil, bubble up, ferment, gush" (12c., Mod.Fr. bouillir), from L. bullire "to bubble, seethe," from bulla "a bubble, knob" (see bull (2)). The native word is seethe. Figurative sense of "to agitate the feelings" is from 1640s.
"I am impatient, and my blood boyls high." [Thomas Otway, "Alcibiades," 1675]
Boiling point is recorded from 1773.

"hard tumor," altered from M.E. bile (Kentish bele), perhaps by association with the verb; from O.E. byl, byle "boil, carbuncle," from W.Gmc. *buljon- "swelling" (cf. O.Fris. bele, O.H.G. bulia, Ger. Beule). Perhaps ultimately from PIE base *bhel- (2) "to swell" (see bole),
or from *bheu- "to grow, swell" (see boast). Cf. O.Ir. bolach "pustule," Goth. ufbauljan "to puff up," Icel. beyla "hump."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

boil (boil)
A painful, circumscribed pus-filled inflammation of the skin and subcutaneous tissue usually caused by a local staphylococcal infection. Also called furuncle.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
boil   (boil)  Pronunciation Key 
To change from a liquid to a gaseous state by being heated to the boiling point and being provided with sufficient energy. Boiling is an example of a phase transition.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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