1. 
   guanidinium
   Referring to a guanidine moiety in a molecule (e.g., in arginine). ... (05 Mar 2000) ...
   Found op http://www.mondofacto.com/facts/dictionary?guanidinium
   
   
2. 
   guanidinium
   Type: Term Pronunciation: gwahn′i-din′ē-ŭm Definitions: 1. Referring to a protonated guanidine moiety in a molecule (in arginine).
   Found op http://www.medilexicon.com/medicaldictionary.php?t=38683
   
   

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