The Collaborative International Dictionary of English v.0.48:
Boil \Boil\, n. [Influenced by boil, v. See Beal, Bile.]
A hard, painful, inflamed tumor, which, on suppuration,
discharges pus, mixed with blood, and discloses a small
fibrous mass of dead tissue, called the core.
A blind boil, one that suppurates imperfectly, or fails to
come to a head.
Delhi boil (Med.), a peculiar affection of the skin,
probably parasitic in origin, prevailing in India (as
among the British troops) and especially at Delhi.