urochord ['juərəkɔ:d]
参考词典中urochord的常规释义：
基本释义
- 尾索(尾索类动物的脊索只存在于尾部的一段)
英英解释
名词解释：
- primitive marine animal having a saclike unsegmented body and a urochord that is conspicuous in the larva
- a notochord of a larval tunicate typically confined to the caudal region
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