Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
an-nūto (better adn-), āre, v. freq., to nod often to, to nod to (ante- and postclass.): alii adnutat, alii adnictat, Naev. ap. Paul. ex Fest. p. 29 Müll. (Com. Rel. p. 19 Rib.); Plaut. Merc. 2, 3, 100; App. M. 10.