fester

Fester first entered English as a noun in the early 14th century. It was originally used as we now use the word fistula, for an abnormal passage leading from an abscess or hollow organ and permitting passage of fluids or secretions. It later came to refer to a sore that discharges pus. The connection between "fester" and "fistula" is no accident - both descend from Latin fistula, which has the same meaning as the English word but can also mean "pipe" or "tube" or "a kind of ulcer." "Fester" made the trip from Latin to English by way of Anglo-French. By the end of the 14th century, it was also being used as a verb meaning "to generate pus," a use that has since developed extended senses implying a worsening state.