Medical Definition of tonsillitis
: inflammation of the tonsils and especially the palatine tonsils typically due to viral or bacterial infection and marked by red enlarged tonsils usually with sore throat, fever, difficult swallowing, hoarseness or loss of voice, and tender or swollen lymph nodes
Seen and Heard
What made you want to look up tonsillitis? Please tell us where you read or heard it (including the quote, if possible).