Boil
Middle English: from Old French boillir, from Latin bullire ‘to bubble’, from bulla ‘bubble’.
wiktionary
From Middle English bile, büle(“boil, tumor”), from Old English bȳl, bȳle(“boil, swelling”), from Proto-Germanic *būlijō, *būlō(“boil”). Akin to German Beule(“boil, hump”), Icelandic beyla(“swelling, hump”).
From Middle English boylen, from Old French boillir (French: bouillir) from Latin bullīre, present active infinitive of bulliō(“I bubble, boil”), from bulla(“bubble”). Displaced native Middle English sethen(“to boil”) (from Old English sēoþan(“to boil, seethe”)), Middle English wellen(“to boil, bubble”) (from Old English wiellan(“to bubble, boil”)), Middle English wallen(“to well up, boil”) (from Old English weallan(“to well up, boil”)). More at seethe, well.
etymonline
boil (v.)
early 13c. (intransitive) "to bubble up, be in a state of ebullition," especially from heat, from Old French bolir "boil, bubble up, ferment, gush" (12c., Modern French bouillir), from Latin bullire "to bubble, seethe," from PIE *beu- "to swell" (see bull (n.2)). The native word is seethe. Figurative sense, of passions, feelings, etc., "be in an agitated state" is from 1640s.
I am impatient, and my blood boyls high. [Thomas Otway, "Alcibiades," 1675]
Transitive sense "put into a boiling condition, cause to boil" is from early 14c. The noun is from mid-15c. as "an act of boiling," 1813 as "state of boiling." Related: Boiled; boiling. Boiling point "temperature at which a liquid is converted into vapor" is recorded from 1773.
boil (n.)
"hard tumor," altered from Middle English bile (Kentish bele), perhaps by association with the verb; from Old English byl, byle "boil, carbuncle," from West Germanic *buljon- "swelling" (source also of Old Frisian bele, Old High German bulia, German Beule). Perhaps ultimately from PIE root *bhel- (2) "to blow, swell," or from *beu- "to grow, swell" (see bull (n.2); also compare boast (n.)). Compare Old Irish bolach "pustule," Gothic ufbauljan "to puff up," Icelandic beyla "hump."
