Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
* ambĭ-vĭum, ii, n. [via], a double way, a place where two roads meet: hic in ambivio navem conscendimus palustrem, Varr. ap. Non. 451, 2.
Ambĭvĭus, ii, m., L. Turpio.