Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
sēmĭ-hĭulcus, a, um, adj., half-opened, half-open: savium, Poët. ap. Gell. 19, 11, 4; Macr. S. 2, 2, 17; cf. semihians.