1885, noun and adjective, from Chordata.
chordate chor·date (kôr'dāt', -dĭt)
n.
An animal of the phylum Chordata, which includes all vertebrates.
Animals that have a central nerve like the human spinal cord.
Note: Chordates make up a phylum in the animal kingdom that includes all the vertebrates, along with some primitive wormlike sea animals. (See Linnean classification.)