Iter

·noun A passage; ·esp., the passage between the third and fourth ventricles in the brain; the aqueduct of Sylvius.

iter
ĭter, ĭtĭnĕris (archaic forms: nom. ĭtĭner, Enn. Pac. Att. Varr. ap. Non. 482, 20; Plaut. Merc. 5, 2...

A New Latin Dictionary by Charlton T. Lewis Ph.D. and Charles Short, LL. D.
iter
iter itineris, n I-, a going, walk, way : dicam in itinere, on the way , T.— A going, journey, pa...

An Elementary Latin Dictionary