urochord

Definitions

  • WordNet 3.6
    • n urochord a notochord of a larval tunicate typically confined to the caudal region
    • n urochord primitive marine animal having a saclike unsegmented body and a urochord that is conspicuous in the larva
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Webster's Revised Unabridged Dictionary
    • n Urochord (Zoöl) The central axis or cord in the tail of larval ascidians and of certain adult tunicates.
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Century Dictionary and Cyclopedia
    • n urochord The caudal chord of an ascidian or tunicate, likened to the notochord, chorda dorsalis, or dorsal chord of a vertebrate; the central axis of the appendage of certain adult tunicates, as an appendicularian, and the corresponding structure of embryonic or larval tunicates in general. It is considered to represent the primordial spinal column of a vertebrate, and to indicate the affinity of the Tunicata with the Vertebrata. See Chordata, Urochorda, Vertebrata, and cut under Appendicularia. Also urocord.
    • n urochord Any member of the Urochorda.
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Chambers's Twentieth Century Dictionary
    • n Urochord ū′rō-kord the caudal chord of an ascidian or tunicate
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Etymology

Webster's Revised Unabridged Dictionary
2d uro-, + chord,