Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
Sēmĭ-graecus, a, um, adj., halfGreek, semi-Grecian: pastores, Varr. R. R. 2, 1, 2: poëtae et oratores, Suet. Gram. 1: civitas (Tarentum), Flor. 1, 18, 6.
* Adv.: Sēmĭgraecē, half in the Greek manner: quod dicimus, Lucil. ap. Vel. Long. p. 2214 P.