bu ‧ bon ‧ ic plague /bjuːˌbɒnɪk ˈpleɪɡ $ buːˌbɑː-/ BrE AmE noun [uncountable]
[ Date: 1800-1900 ; Language: Medieval Latin ; Origin: bubo 'swelling' , from Greek boubon '(swelling in) the groin' ]
a very serious disease spread by rats, that killed a lot of people in the Middle Ages ⇨ Black Death