Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
circŭm-erro, āre, v. n., to wander round, stroll about: neque turba lateri circumerrat, Sen. Contr. 2, 9, 7: tempora (of the revolution of Saturn in his orbit), to pass through, App. de Mundo, p. 71, 11.