Definition of bubo noun from the Oxford Advanced Learner's Dictionary

 

bubo

 noun
noun
BrE BrE//ˈbjuːbəʊ//
 
; NAmE NAmE//ˈbjuːboʊ//
 
(pl. buboes)(medical)
 
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a painful swelling of the lymph node under the arm or in the groin Word Origin late Middle English: from Latin, from Greek boubōn ‘groin or swelling in the groin’.
See the Oxford Advanced American Dictionary entry: bubo