Origin of Octonary
From the Latin octōnārius (“containing eight"), from octōnÄ« (“eight at a time", “by eights", “eight each") + -ārius (whence the English suffix -ary).
Latin octōnārius containing eight from octōnī eight each from octō eight oktō(u) in Indo-European roots
From American Heritage Dictionary of the English Language, 5th Edition
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