Lewis Short
(adjective) : per-nox, noctis
* Continuing through the night, that lasts all night (not ante-Aug.): (bos) jacet pernox instrato cubili,Verg. G. 3, 230: luna pernox erat,was up all night, was at her full,Liv. 5, 28, 10; 21, 49, 9; 32, 11, 9; cf.: addit et exceptas lunā pernocte pruinas,by the light of the full moon,Ov. M. 7, 268; and: luna alias pernox, alias sera, etc.,Plin. 2, 9, 6, § 42: stare pertinaci statu perdius atque pernox,Gell. 2, 1, 2: luditur alea pernox,Juv. 8, 10.
Charlton T. Lewis, Charles Short, A Latin Dictionary