Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
† empŏrĭum, ii, n., = ἐμπόριον, a place of trade, a market-town, market, emporium, mart, Plaut. Am. 4, 1, 4; Varr. R. R. 2, 9, 6; Cic. Att. 5, 2, 2; Liv. 21, 57; 35, 10 fin.; 41, 1; 27; Vitr. 2, 8; Plin. 6, 20, 23, § 72 al.