hemichordate definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
of or pertaining to a phylum (Hemichordata) of wormlike marine animals with visceral clefts and primitive nervous and circulatory systems
Origin: hemi- plush chordate
any hemichordate animal
hemichordate definition by American Heritage Dictionary
The American Heritage® Dictionary of the English Language, 4th edition Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Any of various wormlike marine animals of the phylum Hemichordata, having a primitive notochord and gill slits.adjective
Of or belonging to the phylum Hemichordata.
hemichordate - Science Definition
Any of various mostly small, wormlike marine invertebrates once thought to be chordates but now considered more closely related to echinoderms. They may constitute their own phylum, the Hemichordata. The bodies of hemichordates are divided into a feeding organ called a proboscis, a ringlike section called a collar, and a trunk. Hemichordates have a gut, circulatory system, and nervous system and are filter feeders. Acorn worms and graptolites are hemichordates.