urochord
尾索
U·ro·chord n. Zool. The central axis or cord in the tail of larval ascidians and of certain adult tunicates. [Written also urocord.]
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urochord
n 1: primitive marine animal having a saclike unsegmented body
and a urochord (a notochord) conspicuous in the larva
[syn: tunicate, urochordate]
2: a notochord of a larval tunicate typically confined to the
caudal region