Corundum
Webster's Practical Dictionary- A Practical Dictionary of the Englih Language · 1884 · p. 96
ko-run'dum, n. (31in.) The earth alumina, as found in a crystalline crvstalline state, state.
Bu kavram başka kaynaklarda da geçiyor
Adair's New Encyclopedia (1923)
The American Illustrated Medical Dictionary (1913)
Chamber's Twientieth Century Dictionary (1908)
Chandler's Encyclopedia (1898)
An Illustrated Dictionary of Words Used In Art and Archealogy. (1883)
Zell's Condensed Dictionary (1879)
Dictionary of Science, Literature and Art (1854)
Dictionary of Science, Literature and Art (1842)
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