Tetrad
An Illustrated Dictionary of Medicine, Biology and Allied Sciences · 1907 · p. 48
(tef-rad). An element having an atomicity of four.
Bu kavram başka kaynaklarda da geçiyor
The American Illustrated Medical Dictionary (1913)
Webster's Condensed Dictionary- A Condensed Dictionary of the English Language (1909)
Chamber's Twientieth Century Dictionary (1908)
The Student's Medical Dictionary (1896)
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