Latin

Adjective

octōnī m ‎(feminine octōnae, neuter octōna); first/second declension

1. eight at a time, by eights, eight each
   • 100 BCE – 44 BCE, Julius Caesar, Commentarii de Bello Gallico 7.73

     Huius generis octoni ordines ducti ternos inter se pedes distabant.

     Rows by eights of this kind were dug, they stood apart three feet between them.

   • c. 15 BCE, Vitruvius, De architectura 3.1

     Pseudodipteros autem sic collocatur, ut in fronte et postico sint columnae octonae, in lateribus cum angularibus quindenae.

     The Pseudodipteros, however, is thus assembled so that there are eight columns each in front and rear, fifteen each on the sides including the corner ones.

   • 1611, Johannes Kepler, Strena seu de nive sexangula 20

     Etenim si cubo adimas angulos suos octonos resectos lateribus aequalibus, introrsumque componas plane constitues octaedron.

     Moreover if you remove from a cube its eight corners each cut on equal sides, and arrange them facing inwards, you will clearly produce an octahedron.

Inflection

First/second declension, no singular.

Derived terms

• octōnārius

References

• octoni in Charlton T. Lewis and Charles Short (1879) A Latin Dictionary, Oxford: Clarendon Press
• octoni in Charlton T. Lewis (1891) An Elementary Latin Dictionary, New York: Harper & Brothers
• Félix Gaffiot (1934), “octoni”, in Dictionnaire Illustré Latin-Français, Paris: Hachette.