Found 2 items, similar to pleonaste.
English → English (WordNet) Definition: pleonaste pleonaste n : a dark-colored spinel containing iron [syn: Ceylonite]
English → English (gcide) Definition: pleonaste Ceylanite \Cey"lan*ite\, n. [F., fr. Ceylan Ceylon.] (Min.) A dingy blue, or grayish black, variety of spinel. It is also called pleonaste. [Written also ceylonite.] [1913 Webster]