The Collaborative International Dictionary of English v.0.48:
Iter \I"ter\, n. [L. See Eyre.] (Anat.) A passage; esp., the passage between the third and fourth ventricles in the brain; the aqueduct of Sylvius. [1913 Webster]Bouvier's Law Dictionary, Revised 6th Ed (1856):
ITER. A foot way. Vide Way.