octonary Meaning, Definition & Usage

  1. noun the cardinal number that is the sum of seven and one
    ogdoad; octet; octad; eight; VIII; eighter; 8; eighter from Decatur.

WordNet

Oc`to*na*ry adjective
Etymology
L. octonarius, fr. octoni eight each, fr. octo eight.
Definitions
  1. Of or pertaining to the number eight. Dr. H. More.

Webster 1913