hemichordate

noun

hemi·​chor·​date ˌhe-mi-ˈkȯr-dət 

-ˈkȯr-ˌdāt

: any of a phylum (Hemichordata) of wormlike marine animals (such as an acorn worm) that have in the proboscis an outgrowth of the pharyngeal wall which superficially resembles the notochord of chordates

Word History

Etymology

New Latin Hemichordata, from hemi- + Chordata chordates

First Known Use

1885, in the meaning defined above