Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
sē-mŏdĭus, ii, m. [semi-], a half-peck, Cato, R. R. 11, 3; Col. 2, 10 fin.; 6, 3, 5; Mart. 7, 53, 5; Juv. 14, 67.