opisthuren.

Brit.

/ˈɒpᵻsθ(j)ʊə/, U.S.

/ˈɑpəsˌθʊ(ə)r/

Origin: A borrowing from Greek, combined with an English element. Etymons: opistho- comb. form, Greek οὐρά.

Etymology: < opistho- comb. form + ancient Greek οὐρά tail (see uro- comb. form²).

Ichthyology. Now rare.

The posterior end of the caudal axis in the embryonic stage of certain fishes, which ultimately becomes part of the caudal fin.

ΚΠ

1885 J. A. Ryder in Amer. Naturalist 19 94 The exserted part of the larval axis..may be called the opisthure, in reference to its position in relation to the permanent caudal.

1890 Amer. Naturalist 24 422 (caption) The caudal has become more rounded, the opisthure..is almost wholly absorbed, and the notochord has suffered atrophy.

1907 Ann. N.Y. Acad. Sci. 1906–7 17 508 Gephyrocercy... Derived from heterocercy by degeneration of the opisthure.

This entry has been updated (OED Third Edition, June 2004; most recently modified version published online March 2022).

单词	opisthure
释义	opisthuren. Brit. /ˈɒpᵻsθ(j)ʊə/, U.S. /ˈɑpəsˌθʊ(ə)r/ Origin: A borrowing from Greek, combined with an English element. Etymons: opistho- comb. form, Greek οὐρά. Etymology: < opistho- comb. form + ancient Greek οὐρά tail (see uro- comb. form²). Ichthyology. Now rare. The posterior end of the caudal axis in the embryonic stage of certain fishes, which ultimately becomes part of the caudal fin. ΚΠ 1885 J. A. Ryder in Amer. Naturalist 19 94 The exserted part of the larval axis..may be called the opisthure, in reference to its position in relation to the permanent caudal. 1890 Amer. Naturalist 24 422 (caption) The caudal has become more rounded, the opisthure..is almost wholly absorbed, and the notochord has suffered atrophy. 1907 Ann. N.Y. Acad. Sci. 1906–7 17 508 Gephyrocercy... Derived from heterocercy by degeneration of the opisthure. This entry has been updated (OED Third Edition, June 2004; most recently modified version published online March 2022). < n.1885
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