1. natis — de Vaan
natis 'buttock' [f. i] (Pl>) Derivatives: mostly pL nates, -htm. Pit. *(g/s)nati~. PIE *nHt-? IE cognates: Gr. νώτον [a] 'back; wide surface'. The connection between natis and Gr. νώτον, two isolated words, is certainly possible from the semantic side, but remains formally uncertain. Schrijver reconstructs a root noun *n(e)h3t- from which Latin would have derived an /-stem *nh3t-i- and Greek an o-stem *ne/oh3t-o-. … — [de Vaan, s.v. natis, p. 416]