Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
ātrĭensis, is, m. [atrium], the overseer of the hall or court (atrium), and in gen. of the house, a steward, major-domo, Plaut. Poen. 5, 5, 4; so id. As. 2, 1, 16; 2, 2, 80; id. Ps. 2, 2, 15; Cic. Par. 5, 2, 38; id. Pis. 27 fin. (not elsewh. in Cic.; for in Parad. 5, 2, 36, atriensis et topiarii is a gloss; v. Orell. ad h. l.; so B. and K.); so Phaedr. 2, 5, 11; Col. 12, 3, 9; Plin. Ep. 3, 19, 3; Petr. 29, 9; 53, 10; 72, 8; Suet. Calig. 57.