Lewis Short
octōgēni, ae, a (
* Gen. plur. octogenūm, Front. Aquaed. 58), num. distr. adj. [octo], eighty each: data ex praedā militibus aeris octogeni bini,Liv. 10, 30.
* In gen., eighty: fetus,Plin. 9, 51, 75, § 165.
Charlton T. Lewis, Charles Short, A Latin Dictionary