Webster dictionary was developed by Noah Webster in the beginning of 19th century. On this website, you can find definition for Ullmannite from the 1913 edition of Webster's Revised Unabridged Dictionary. Define Ullmannite using one of the most comprehensive free online dictionaries on the web.

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Part of Speech: noun
Results: 1
1. A brittle mineral of a steel- gray color and metallic luster, containing antimony, arsenic, sulphur, and nickel.
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