Tetrad: Definition and part of speech

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Tetrad

  1. n. A tetravalent or quadrivalent atom or radical; as, carbon is a tetrad.
  2. n. The number four; a collection of four things; a quaternion.

The word meanings were obtained from OPTED(The Online Plain Text English Dictionary), which is based on “The Project Gutenberg Etext of Webster’s Unabridged Dictionary” which is in turn based on the 1913 US Webster’s Unabridged Dictionary (See Project Gutenburg), as a text file.

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