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Definition of quinsy. plural. quinsies. : an abscess in the tissue around a tonsil usually resulting from bacterial infection and often accompanied by pain and fever.
Quinsy or to be more precise âperitonsillar abscess formationâstarts as an inflammation of the tonsils, accompanied by a sore throat as well. It usually affects one tonsil in particular and develops into two pus-filled abscesses on the tonsils.ne theory is that quinsy occurs as a complication of tonsillitis. This is said to happen if tonsillitis is left untreated or if it not treated properly. The second theory is a problem with the Weberâs glands. These glands lie just above the tonsils and produce saliva to clear away any germs or debris from this area.