lanthanum
The American Illustrated Medical Dictionary · 1913 · p. 16
(lan’than-um) [Gr. λανθάνειν to conceal]. A rare metallic element: symbol, La.
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A Dictionary of Scientific Terms (1927)
Hawkins' Electrical Dictionary (1915)
Chamber's Twientieth Century Dictionary (1908)
An Illustrated Dictionary of Medicine, Biology and Allied Sciences (1907)
Chandler's Encyclopedia (1898)
An Illustrated Encyclopedic Medical Dictionary (1893)
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