1. 
   Pyridinium
   Pyridinium refers to the cationic form of pyridine. This can either be due to protonation of the ring nitrogen or because of addition of a substituent to the ring nitrogen, typically via alkylation. The lone pair of electrons on the nitrogen atom of pyridine is not delocalized, and thus pyridine ca...
   Found op http://en.wikipedia.org/wiki/Pyridinium
   
   
2. 
   pyridinium
   Type: Term Pronunciation: pir′i-din′ē-ŭm Definitions: 1. A breakdown product of bone collagen, excreted in urine, and assayed as a measure of osteoclast activity; increased in disease states such as Paget disease, primary hyperparathyroidism, and postmenopausal osteoporosis.
   Found op http://www.medilexicon.com/medicaldictionary.php?t=74484
   
   

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