† orthaxialadj.
Ichthyology. Obsolete.
Having a straight vertebral axis, as a protocercal tail.
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the world > animals > fish > parts of fish > [adjective] > having fin(s) > having specific type of caudal fin
heterocercal1838
homocercal1838
gephyrocercal1886
orthaxial1886
homocerc-
1886 J. 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.
This entry has been updated (OED Third Edition, September 2004; most recently modified version published online June 2018).
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