rĕnūtus — Lewis & Short
rĕnūtus, ūs, m.renuo,
I a denying, refusal; a word formed by Pliny the Younger, for the Homeric a)ne/neusen (Il. 16, 250):
ego quoque simili nutu ac renutu respondere voto tuo possum,Plin. Ep. 1, 7, 2.