Lewis Short
nixor, āri
* Dep. n. [1. nitor], to lean or rest upon; to strive, endeavor (poet.).
* Lit., Lucr. 6, 836; 3, 1001: pars vulnere clauda retentat Nixantem (serpentem),Verg. A. 5, 279 Wagner N. cr.
* Trop., to depend upon: fundamenta, quibus nixatur vita salusque,Lucr. 4, 506.
Charlton T. Lewis, Charles Short, A Latin Dictionary