Is·i·dore of Seville (?z??-dôr?), Saint 560?-636. Spanish scholar and ecclesiastic. He wrote the encyclopedia Etymologiae, an important reference work throughout the Middle Ages.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.Isidore of Seville (??z?d??) n (Biography) Saint, Latin name Isidorus Hispalensis. ?560?636 ad, Spanish archbishop and scholar, noted for his Etymologies, an encyclopedia. Feast day: April 4Collins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014Is?i?dore of Seville? (??z ??d?r, -?do?r) n. Saint (Isidorus Hispalensis), A.D. c570?636, Spanish archbishop, historian, and encyclopedist. Random House Kernerman Webster’s College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.