Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
* ad-mī̆gro, āre, 1, v. n., lit., to go to a place; hence, trop., to come to, to be added to: ad paupertatem si admigrant infamiae, Plaut. Pers. 3, 1, 19.