Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
sēmĭ-hĭans, antis, adj. [hio], halfopened, half-open: labellum, Cat. 61, 220; cf. labiae, App. M: 10, p. 252, 32; cf. semihiulcus.