Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
Pentĕlĭcus, a, um, adj., = Πεντελικός, of or belonging to a mountain near Athens (in the demos of Πεντελή), celebrated for its while marble, Pentelie: Hermae Pentelici, of Pentelic marble, Cic. Att. 1, 8, 2.