
1) Having a valence of four 2) Tetravalent
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• (a.) Having a valence of four; capable of combining with, being replaced by, or compared with, four monad atoms; tetravalent; -- said of certain atoms and radicals; thus, carbon and silicon are quadrivalent elements.
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http://thinkexist.com/dictionary/meaning/quadrivalent/

Describes an association of four homologous chromosomes at meiosis. ... (09 Oct 1997) ...
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http://www.encyclo.co.uk/local/20973

(kwod″rĭ-va´lәnt) having a valence of four.
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http://www.encyclo.co.uk/local/21001
Quad·riv'a·lent adjective [
Quadri- + Latin
valens ,
-entis , present participle See
Valence .]
(Chemistry) Having a valence of four; capable of combining with, being replaced by, or compared with, four monad atoms; tetravalent; -- said of certain atoms and radicals...
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http://www.encyclo.co.uk/webster/Q/2

Type: Term Pronunciation: kwah′dri-vā′lĕnt Definitions: 1. Having the combining power (valency) of four. Synonyms: tetravalent
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http://www.medilexicon.com/medicaldictionary.php?t=74625

having a valence of four; tetravalent. · exhibiting four different valences, as antimony with valences of 5, 4, 3, and −3.
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https://www.infoplease.com/dictionary/quadrivalent
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