n. [ From Autun, France, its locality. ] (Min.) A lemon-yellow phosphate of uranium and calcium occurring in tabular crystals with basal cleavage, and in micalike scales. H., 2-2.5. Sp. gr., 3.05-3.19. [ Webster 1913 Suppl. ]
n. (Metallurgy) [ From W. C. Roberts-Austen, an English metallurgist. ] a solid solution of ferric carbide or carbon in iron; -- it cools to form pearlite or martensite. [ WordNet 1.5 ]
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