Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
† prŏcoeton, ōnis, m., = προκοιτών, an anteroom, antechamber (post-Aug.), Plin. Ep. 2, 17, 10 and 23 (in Varr. R. R. 2, prooem. § 2, written as Greek).