Definition of polysyllabic adjective from the Oxford Advanced Learner's Dictionary

 

polysyllabic

 adjective
adjective
BrE BrE//ˌpɒlisɪˈlæbɪk//
 
; NAmE NAmE//ˌpɑːlisɪˈlæbɪk//
 
(specialist)
 
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(of a word) having several (usually more than three) syllables