Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
1. hostus, i, m. [perh. a rustic term for haustus], the yield of an olive-tree, Cato, R. R. 6, 2; Varr. R. R. 1, 24, 2.
2. Hostus, i, m., a Roman prœnomen, as Hostus Hostilius, Liv. 1, 12; Macr. S. 1, 6: Hostus Lucretius Tricipitinus, Liv. 4, 30 al.