Definition of hemichordate
: any of a phylum (Hemichordata) of wormlike marine animals (as an acorn worm) that have in the proboscis an outgrowth of the pharyngeal wall which superficially resembles the notochord of chordates
Origin of hemichordate
New Latin Hemichordata, from hemi- + Chordata chordates
First Known Use: 1885
Learn More about hemichordate
Britannica.com: Encyclopedia article about "hemichordate"
Seen and Heard
What made you want to look up hemichordate? Please tell us where you read or heard it (including the quote, if possible).