ichthyˈopsidanadj. and n. (also ichthyopˈsidian) = ichthyopsidadj. and n.
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ichthyopsid1871
ichthyopsidan1887
1887 J. Cleland in Nature 24 Feb. 391/1 There were two kinds of protovertebrates, namely, piscine and reptilian—or ichthyopsidan and sauropsidan, as Prof. Parker would probably prefer to call them.