Examples from the Web for gumboil
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!
If he has sciatica, pleurisy or a gumboil, he can speak of his ailments and tell people what is the matter with him.Nervous Breakdowns and How to Avoid Them|Charles David Musgrove
A good example of this is seen in what is known as a gumboil.Physiology|Ernest G. Martin
I've been young myself, and I know youth is touchy as a gumboil when it comes to love affairs.The Faith Healer|William Vaughn Moody