Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
† tē̆trarchĭa, ae, f., = τετραρχία, the dominions of a tetrarch, a tetrarchy, Cic. Deiot. 15, 42; id. Div. 1, 15, 27; Auct. B. Alex. 78, 3.