Thé·rèse de Li·sieux (t?-r?z? d? l?-zy??), Saint Known as “the Little Flower.” 1873-1897. French nun whose autobiography, Story of a Soul (1898), recounts her search for spiritual innocence. She was canonized in 1925.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.Thérèse de Lisieux (French ter?z d? lizjø) n (Biography) Saint, known as the Little Flower of Jesus. 1873?97, French Carmelite nun, noted for her autobiography, The Story of a Soul (1897). Feast day: Oct 3Collins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014