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Any of a numerous animals of the group Deuterostomia, in which the anus develops from the first opening in the embryo and the mouth develops later, and including the echinoderms, hemichordates, and chordates.
[From New Latin Deuterostomia, taxon name : deutero- + New Latin stoma; see stoma.]
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.
any member of the major group of animals defined by the fact that during early embryonic development the first opening to form becomes the anus of the animal. The opposite is protostome
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
deu•ter•o•stome(ˈdu tər əˌstoʊm, ˈdyu-)
1. a mouth that develops separately from the blastopore.
2. an animal with this form of development, as an echinoderm or chordate.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.