octuplet

[ok-tuhp-lit, -too-plit, -tyoo-; ok-too-plit, -tyoo-]
noun
  1. a group, series, or combination of eight related items.
  2. Music. a group of eight notes that are to be played or sung in the same time as six notes of equal value.

Origin of octuplet

First recorded in 1850–55; octuple + -et
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018