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

 

tercet

 noun
noun
BrE BrE//ˈtɜːsɪt//
 
; NAmE NAmE//ˈtɜːrsɪt//
 
(specialist)
 
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a group of three lines of poetry that rhyme with each other or with the three lines before or after it Word Origin late 16th cent.: from French, from Italian terzetto, diminutive of terzo ‘third’, from Latin tertius.
See the Oxford Advanced American Dictionary entry: tercet