polysyllable

noun
poly·​syl·​la·​ble | \ˈpä-lē-ˌsi-lə-bəl, ˌpä-lē-ˈsi-\

Definition of polysyllable 

: a polysyllabic word

First Known Use of polysyllable

1570, in the meaning defined above

History and Etymology for polysyllable

modification of Medieval Latin polysyllaba, from feminine of polysyllabus

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The first known use of polysyllable was in 1570

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