PENTAD
An Illustrated Encyclopedic Medical Dictionary · 1894 · p. 10
n. Peant'a2d. From irfirt, five. A quinquivalent element or radicle. [B.] [s. 233]
Bu kavram başka kaynaklarda da geçiyor
Webster's Condensed Dictionary- A Condensed Dictionary of the English Language (1909)
Chamber's Twientieth Century Dictionary (1908)
Webster's Practical Dictionary- A Practical Dictionary of the Englih Language (1884)
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