Etymology
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Chordata

"division of the animal kingdom including the true vertebrates," 1880, Modern Latin, from neuter plural of Latin chordatus "having a (spinal) cord," from chorda "cord, string" (from PIE root *ghere- "gut, entrail").

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Definitions of Chordata

Chordata (n.)
comprises true vertebrates and animals having a notochord;
Synonyms: phylum Chordata
From wordnet.princeton.edu