Definition of polysyllable noun from the Oxford Advanced American Dictionary

 

polysyllable

 noun
noun
NAmE//ˈpɑliˌsɪləbl//
 
(technology)
 
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a word of several (usually more than three) syllables
polysyllabic
 
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NAmE//ˌpɑlisɪˈlæbɪk//
 
adjective
See the Oxford Advanced Learner's Dictionary entry: polysyllable