Definition of "gumboil" [gum•boil]

• A small boil or abscess on the gum, often resulting from tooth decay. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "‘Toothache,’ growled Topsy, in reply, ‘not gumboil;’ the remedy suggested by Mrs Pulchop being for the latter of these ills."
• "The crewman with the bat said, "Is this little gumboil telling the truth, mister?""
• "George, my dear old school-chum, with the V.C., and his wife tells me of it as casually as if it had been a gumboil!"