aeterno
From LSJ
aeternō: adv., v. aeternus
I fin. 3.
aeterno: āre, v. a. aeternus,
I to perpetuate, to immortalize (rare, perh. extant only in the two foll. exs.): litteris ac laudibus aeternare, Varr. ap. Non. 75, 20: virtutes in aevum, * Hor. C. 4, 14, 5.