plural noun
Pro·​to·​chordata | \"+\

Definition of Protochordata 

in some classifications

: a major division of Chordata comprising the Hemichordata, Urochordata, and usually the Cephalochordata

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Other Words from Protochordata

protochordate \ "+ \ adjective or noun

History and Etymology for Protochordata

New Latin, from prot- + Chordata

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