schistaceous
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Schistaceous — Schis*ta ceous, a. Of a slate color. [1913 Webster] … The Collaborative International Dictionary of English
schist — n. foliated metamorphic crystalline rock. ♦ schistaceous, a. slate coloured. ♦ schistic, ♦ schistose, a. ♦ schistoid, a. like schist. ♦ schistosis, n. fibrosis of lungs from inhaling slate dust … Dictionary of difficult words