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单词 orthaxial
释义 orthaxial, a. Ichthyol.|ɔːˈθæksɪəl|
[f. ortho-, orth-, straight + axial.]
Having the vertebral axis straight, as the tail of a diphycercal fish.
1886J. A. Ryder in Rep. U.S. Comm. Fisheries 1884 985 The word orthaxial is used to designate the archaic straight type of vertebrate axis which is not bent upwards at its posterior extremity.
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