Bible Dictionaries
Tetrad
Webster's Dictionary
(1):
(n.) The number four; a collection of four things; a quaternion.
(2):
(n.) A tetravalent or quadrivalent atom or radical; as, carbon is a tetrad.
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Bibliography Information
Webster, Noah. Entry for 'Tetrad'. Noah Webster's American Dictionary. https://www.studylight.org/dictionaries/eng/web/t/tetrad.html. 1828.