parachordaladj.n.

Brit.

/ˌparəˈkɔːdl/, U.S.

/ˌpɛrəˈkɔrd(ə)l/

Origin: Formed within English, by derivation. Etymons: para- prefix¹, chord n.¹, -al suffix¹.

Etymology: < para- prefix¹ + chord n.¹ + -al suffix¹.

Embryology.

A. adj.

Situated beside the notochord; spec. designating either of a pair of cartilaginous plates which form the foundation of the skull in mammalian embryos.

ΚΠ

1875 T. H. Huxley in Proc. Royal Soc. 23 130 The postauditory, or parachordal, region of the skull of the higher Vertebrata.

1881 St. G. Mivart Cat 337 The basi~cranial plate or parachordal cartilage.

1974 D. Webster & M. Webster Compar. Vertebr. Morphol. iv. 57 The lateral somatic mesoderm flanking its anterior end differentiates into two parachordal cartilages.

1999 Proc. National Acad. Sci. U.S.A. 96 9700/1 The notochord signals to the parachordal mesoderm in formation of the basisphenoid bone.

B. n.

A parachordal cartilage.

ΘΚΠ

the world > life > biology > biological processes > procreation or reproduction > embryo or fetus > embryo parts > [noun] > skull or brain

visceral cleft1870

metencephalon1871

chondrocranium1875

protocerebrum1885

protencephalon1887

parachordal1892

tritencephalon1910

parencephalon1911

1892 New Sydenham Soc. Lexicon (at cited word) The parachordals with the cephalic portion of the notochord form the basilar plate.

1934 Philos. Trans. (Royal Soc.) B. 223 429 The anterior parachordals have established connexion.

1986 A. S. Romer & T. S. Parsons Vertebr. Body (ed. 6) vii. 192 The parachordals are a pair of cartilages that develop beneath the posterior part of the brain on either side of the notochord.

This entry has been updated (OED Third Edition, June 2005; most recently modified version published online March 2022).

单词	parachordal
释义	parachordaladj.n. Brit. /ˌparəˈkɔːdl/, U.S. /ˌpɛrəˈkɔrd(ə)l/ Origin: Formed within English, by derivation. Etymons: para- prefix¹, chord n.¹, -al suffix¹. Etymology: < para- prefix¹ + chord n.¹ + -al suffix¹. Embryology. A. adj. Situated beside the notochord; spec. designating either of a pair of cartilaginous plates which form the foundation of the skull in mammalian embryos. ΚΠ 1875 T. H. Huxley in Proc. Royal Soc. 23 130 The postauditory, or parachordal, region of the skull of the higher Vertebrata. 1881 St. G. Mivart Cat 337 The basi~cranial plate or parachordal cartilage. 1974 D. Webster & M. Webster Compar. Vertebr. Morphol. iv. 57 The lateral somatic mesoderm flanking its anterior end differentiates into two parachordal cartilages. 1999 Proc. National Acad. Sci. U.S.A. 96 9700/1 The notochord signals to the parachordal mesoderm in formation of the basisphenoid bone. B. n. A parachordal cartilage. ΘΚΠ the world > life > biology > biological processes > procreation or reproduction > embryo or fetus > embryo parts > [noun] > skull or brain visceral cleft1870 metencephalon1871 chondrocranium1875 protocerebrum1885 protencephalon1887 parachordal1892 tritencephalon1910 parencephalon1911 1892 New Sydenham Soc. Lexicon (at cited word) The parachordals with the cephalic portion of the notochord form the basilar plate. 1934 Philos. Trans. (Royal Soc.) B. 223 429 The anterior parachordals have established connexion. 1986 A. S. Romer & T. S. Parsons Vertebr. Body (ed. 6) vii. 192 The parachordals are a pair of cartilages that develop beneath the posterior part of the brain on either side of the notochord. This entry has been updated (OED Third Edition, June 2005; most recently modified version published online March 2022). < adj.n.1875
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