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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 itself is not contagious but the causative agent can be passed from one person to another by saliva.bout contagion and contagiousness: Contagion and contagiousness refers to how easily the spread of Quinsy is possible from one person to another. Other words for contagion include infection, infectiousness, transmission or transmissability.