fe·ces (f??s?z)n. (used with a sing. or pl. verb) Waste matter eliminated from the bowels; excrement.[Middle English, from Latin faec?s, pl. of faex, dregs.]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.feces (?fi?si?z) pl n (Physiology) the usual US spelling of faecesCollins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014fe?ces (?fi siz) n. (used with a pl. v.) waste matter discharged from the intestines through the anus; excrement. Also, esp. Brit., faeces. [1425?75; late Middle English