polysyllable - definition and synonyms

noun [countable] linguistics 

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/ˈpɒliˌsɪləb(ə)l/
singularpolysyllable
pluralpolysyllables
  1. a word that has more than two syllables

derived word

polysyllabic

 

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/ˌpɒlisɪˈlæbɪk/
adjective