octosyllable

noun
oc·​to·​syl·​la·​ble | \ ˈäk-tə-ˌsi-lə-bəl How to pronounce octosyllable (audio) , ˌäk-tə-ˈsi-\

Definition of octosyllable

: a word or line of eight syllables

First Known Use of octosyllable

circa 1846, in the meaning defined above

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