Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
conclāve, is (gen. plur. heterocl. conclaviorum, Vitr. 6, 3, 8: conclavium, id. 7, 9), n. [clavis: conclavia dicuntur loca, quae unā clave clauduntur, Paul. ex Fest. p. 39, 9 Müll.; cf. Don. ad Ter. Eun. 3, 5, 35], a room, chamber, dining hall, cage for animals, stall, coop, etc., that may be locked up.