Chordata

noun plural
Chor·da·ta | \kȯr-ˈdät-ə, -ˈdāt-ə \

Medical Definition of Chordata 

: a phylum comprising animals having at least at some stage of development a more or less well-developed notochord, a dorsally situated central nervous system, and gill clefts in the walls of the pharynx and including the vertebrates, lancelets, and tunicates

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