quitter

Short definition from Wiktionary

Noun

1. 1
   Matter flowing from a wound or sore; pus.
2. 2
   Alternative spelling of quittor (“fistulous wound at the top of a horse's foot”).
3. 3
   Scoria of tin.
4. 4
   One who quits, as: One who gives in.
5. 5
   One who quits, as: One who succeeds in desisting from a vice, especially smoking, drinking, or drugging.
6. 6
   A leaver.
7. 7
   A deliverer.

Verb

1. 1
   To suppurate; ooze with pus.