epichordaladj.

Brit.

/ˌɛpᵻˈkɔːdl/, U.S.

/ˌɛpəˈkɔrd(ə)l/

Origin: Formed within English, by derivation. Etymons: epi- prefix, chordal adj.

Etymology: < epi- prefix + chordal adj. In sense 1 after German epichordal ( C. Gegenbaur Untersuchungen zur vergleichenden Anat. d. Wirbelsäule bei Amphibien, Reptilien (1862) v. 22).

1. Embryology. Situated or occurring dorsal to or adjacent to the notochord.Cf. hypochordal adj. at hypo- prefix 2, perichordal adj. at peri- prefix 2a, prechordal adj. 1, prochordal adj.

ΘΚΠ

the world > animals > animal body > general parts > constituent materials > [adjective] > vertebrate > on dorsal side of notochord

epichordal1878

1878 A. Macalister Introd. Systematic Zool. & Morphol. Vertebr. Animals xii. 97 In the development of the vertebræ the formation of the body is for the most part perichordal, but in Pipa, Pelobates, &c., it is epichordal.

1920 Jrnl. Compar. Neurol. 32 129 Ahlborn, in the lamprey, so divided the brain into epichordal and prechordal regions.

1959 Q. Rev. Biol. 34 15/2 The definitive centrum is wholly dorsal to the notochord, thus ‘epichordal’.

2013 L. Puelles in J. Rubenstein & P. Rakic Patterning & Cell Type Specif. Developing CNS & PNS x. 192/2 Note that the entire primordial brain vesicle is likewise epichordal in amphioxus.

2. Zoology. Designating the upper (dorsal) lobe of the tail fin of a shark or certain other fishes; of or relating to such a lobe.

ΚΠ

1909 E. S. Goodrich in E. R. Lankester Treat. Zool. IX. 104 A caudal fin formed of a dorsal (epichordal) and a ventral (hypochordal) lobe.

1944 Trans. Kansas Acad. Sci. 47 137 The caudal fin is ‘hypocercal’, i.e., resembling a heterocercal fin minus its upper (epichordal) lobe.

1977 Fieldiana: Geol. 33 534 Edestoid postcranial characters, such as..the heterocercal caudal fin with an epichordal contribution are strikingly different than other paraselachii.

2013 A. P. Klimley Biol. Sharks & Rays ii. 18 The caudal fin of Cladoselache had similarly sized upper epichordal and lower hypochordal lobes.

This entry has been updated (OED Third Edition, March 2016; most recently modified version published online March 2022).

单词	epichordal
释义	epichordaladj. Brit. /ˌɛpᵻˈkɔːdl/, U.S. /ˌɛpəˈkɔrd(ə)l/ Origin: Formed within English, by derivation. Etymons: epi- prefix, chordal adj. Etymology: < epi- prefix + chordal adj. In sense 1 after German epichordal ( C. Gegenbaur Untersuchungen zur vergleichenden Anat. d. Wirbelsäule bei Amphibien, Reptilien (1862) v. 22). 1. Embryology. Situated or occurring dorsal to or adjacent to the notochord.Cf. hypochordal adj. at hypo- prefix 2, perichordal adj. at peri- prefix 2a, prechordal adj. 1, prochordal adj. ΘΚΠ the world > animals > animal body > general parts > constituent materials > [adjective] > vertebrate > on dorsal side of notochord epichordal1878 1878 A. Macalister Introd. Systematic Zool. & Morphol. Vertebr. Animals xii. 97 In the development of the vertebræ the formation of the body is for the most part perichordal, but in Pipa, Pelobates, &c., it is epichordal. 1920 Jrnl. Compar. Neurol. 32 129 Ahlborn, in the lamprey, so divided the brain into epichordal and prechordal regions. 1959 Q. Rev. Biol. 34 15/2 The definitive centrum is wholly dorsal to the notochord, thus ‘epichordal’. 2013 L. Puelles in J. Rubenstein & P. Rakic Patterning & Cell Type Specif. Developing CNS & PNS x. 192/2 Note that the entire primordial brain vesicle is likewise epichordal in amphioxus. 2. Zoology. Designating the upper (dorsal) lobe of the tail fin of a shark or certain other fishes; of or relating to such a lobe. ΚΠ 1909 E. S. Goodrich in E. R. Lankester Treat. Zool. IX. 104 A caudal fin formed of a dorsal (epichordal) and a ventral (hypochordal) lobe. 1944 Trans. Kansas Acad. Sci. 47 137 The caudal fin is ‘hypocercal’, i.e., resembling a heterocercal fin minus its upper (epichordal) lobe. 1977 Fieldiana: Geol. 33 534 Edestoid postcranial characters, such as..the heterocercal caudal fin with an epichordal contribution are strikingly different than other paraselachii. 2013 A. P. Klimley Biol. Sharks & Rays ii. 18 The caudal fin of Cladoselache had similarly sized upper epichordal and lower hypochordal lobes. This entry has been updated (OED Third Edition, March 2016; most recently modified version published online March 2022). < adj.1878
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