pyr·i·dox·ine (p?r??-d?k?s?n, -s?n) also pyr·i·dox·in (-d?k?s?n)n. A pyridine derivative, C8H11NO3, that is one of several forms of vitamin B6 and is the form typically found in vitamin supplements and enriched foods.[pyrid(ine) + ox(o)- + -ine.]American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.pyridoxine (?p?r??d?ksi?n) or pyridoxinn (Elements & Compounds) biochem a derivative of pyridine that is a precursor of the compounds pyridoxal and pyridoxamine. Also: vitamin B6 [C20: from pyrid(ine) + ox(ygen) +-ine2]Collins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014pyr?i?dox?ine (?p?r ??d?k sin, -s?n) also pyr?i?dox?in (-s?n) n. a derivative of pyridine, required in forming hemoglobin and in preventing pellagra; vitamin B6. [1935?40; pyrid (ine) + ox (ygen) + -ine2] Random House Kernerman Webster’s College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.pyr·i·dox·ine (p?r??-d?k?s?n) See under vitamin B complex.The American Heritage® Student Science Dictionary, Second Edition. Copyright © 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.