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Webster 1913 Edition

Noun.

[2d

uro-

chord

(Zool.)

The central axis or cord in the tail of larval ascidians and of certain adult tunicates.

[Written also

urocord

urochord ‎(plural urochords)

(zoology) a notochord that is limited to the caudal region; especially in the Urochordata
any marine organism of the Urochordata