noun Zoology.

any of the nonvertebrate chordates, as the tunicates, cephalochordates, and hemichordates.

Origin of protochordate

1890–95; < New Latin Protochordata name of the group; see proto-, chordate Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for protochordate



any chordate animal of the subphyla Hemichordata (acorn worms), Urochordata (tunicates), and Cephalochordata (lancelets)


of or relating to protochordates
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012