Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
ăd-ambŭlo, āre, 1, v. n., to walk about, at, or near a thing (rare; used only before and after the class. per.): ad ostium, Plaut. Bacch. 4, 5, 8.
Also with dat.: seni, App. M. 11, p. 261; so lateri, 3, 26.