Lewis Short
rĕnūtus (noun M) : renuo
* A denying, refusal; a word formed by Pliny the Younger, for the Homeric ἀνένευσεν (Il. 16, 250): ego quoque simili nutu ac renutu respondere voto tuo possum,Plin. Ep. 1, 7, 2.
Charlton T. Lewis, Charles Short, A Latin Dictionary