1. Of or relating to the number eight.
2. Consisting of eight members or of groups containing eight.
n. pl. oc·to·nar·ies
A group or set of eight.
[Latin octōnārius, containing eight, from octōnī, eight each, from octō, eight; see oktō(u) in the Appendix of Indo-European roots.]
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2018 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.