Tetrad
The Student's Medical Dictionary · 1896 · p. 621
(ted-rad) [rerpa, four]. An element having an atomicity of four. 621
Bu kavram başka kaynaklarda da geçiyor
The American Illustrated Medical Dictionary (1913)
Chamber's Twientieth Century Dictionary (1908)
An Illustrated Dictionary of Medicine, Biology and Allied Sciences (1907)
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