Definition of boon companion noun from the Oxford Advanced Learner's Dictionary

 

boon companion

 noun
noun
BrE
 
; NAmE
 
(literary)
 
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a very good friend Word Origin mid 16th cent.: boon from Old French bon, from Latin bonus ‘good’. The early literal sense was ‘good fellow’, originally denoting a drinking companion.
See the Oxford Advanced American Dictionary entry: boon companion