metacoeln.

Brit.

/ˈmɛtəsiːl/, U.S.

/ˈmɛdəˌsil/

Forms: 1800s– metacoele, 1900s– metacoel.

Origin: Formed within English, by derivation. Etymons: meta- prefix, -coele comb. form.

Etymology: < meta- prefix + -coele comb. form. Compare slightly earlier metacoelia n. Compare also mesocoel n.With senses 2 and 3 compare meta- prefix 3.

†1. Zoology. In form metacoele. A secondarily formed coelom, esp. the reduced form present in leeches; a pseudocoel or schizocoel. Obsolete.

ΚΠ

1884 G. Bourne in Q. Jrnl. Microsc. Sci. 24 477 An archaic enterocœle thus gradually undergoes diacœlosis, being replaced by a metacœle.

1888 G. Rolleston & W. H. Jackson Forms Animal Life (ed. 2) p. xxix It [sc. a second type of coelom] is a system of channels and spaces excavated in the mesoblast secondarily. To this type the name metacoele might be applied.

2. Anatomy and Zoology. In form metacoele. (The caudal part of) the fourth ventricle of the brain. Cf. metacoelia n. rare.

ΚΠ

1887 Buck's Handbk. Med. Sci. VIII. 124/2 The cavity, a tube in the myel and caudal part of the postoblongata is expanded into an irregular triangular fossa, the metacœle or caudal part of the fourth ventricle.

1892 Philos. Trans. 1891 (Royal Soc.) B. 182 121/2 Metacœle (4th ventricle).

1995 Larousse Dict. Sci. & Technol. 694/1 Metacoele, in Craniata, the cavity of the hind~brain; the fourth ventricle.

3. Zoology. Usually in form metacoel. The most posterior division of the coelomic cavity of a hemichordate or lophophorate. Also: the somatocoel of an echinoderm.

ΚΠ

1947 T. Gislén in Zoologiska Bidrag från Uppsala 25 405 A being which had fixed itself with the front end on the bottom or which crept on the front end had..already advanced far in the reduction of its right foremost coelom...The other two pairs of coeloms, the hydrocoeles (collar coeloms) and somatocoeles or, more neutrally, the meso- and metacoeles, may have been relatively unaffected.

1955 L. H. Hyman Invertebrates IV. xv. 692 It was Heider (1912) who proposed for these three paired sacs the names axocoel, hydrocoel, and somatocoel; Gislén (1947) has suggested the more general terms protocoel, mesocoel, and metacoel.

1967 C. P. Hickman Biol. Invertebr. xxix. 611/2 The coelom of hemichordates is divided into three segments: the proboscis, or protocoel, with a single cavity; the collar, or mesocoel, with two cavities; and the trunk, or metacoel, with two cavities.

1987 M. S. Laverack & J. Dando Lect. Notes Invertebr. Zool. (ed. 3) xxviii. 165/1 The major body cavity [of a bryozoan] is the metacoel (in the metasome).

1994 E. E. Ruppert & R. D. Barnes Invertebr. Zool. (ed. 6) xvii. 868/1 A pair of metacoels is found in the trunk [of an acorn worm].

This entry has been updated (OED Third Edition, December 2001; most recently modified version published online March 2022).

单词	metacoel
释义	metacoeln. Brit. /ˈmɛtəsiːl/, U.S. /ˈmɛdəˌsil/ Forms: 1800s– metacoele, 1900s– metacoel. Origin: Formed within English, by derivation. Etymons: meta- prefix, -coele comb. form. Etymology: < meta- prefix + -coele comb. form. Compare slightly earlier metacoelia n. Compare also mesocoel n.With senses 2 and 3 compare meta- prefix 3. †1. Zoology. In form metacoele. A secondarily formed coelom, esp. the reduced form present in leeches; a pseudocoel or schizocoel. Obsolete. ΚΠ 1884 G. Bourne in Q. Jrnl. Microsc. Sci. 24 477 An archaic enterocœle thus gradually undergoes diacœlosis, being replaced by a metacœle. 1888 G. Rolleston & W. H. Jackson Forms Animal Life (ed. 2) p. xxix It [sc. a second type of coelom] is a system of channels and spaces excavated in the mesoblast secondarily. To this type the name metacoele might be applied. 2. Anatomy and Zoology. In form metacoele. (The caudal part of) the fourth ventricle of the brain. Cf. metacoelia n. rare. ΚΠ 1887 Buck's Handbk. Med. Sci. VIII. 124/2 The cavity, a tube in the myel and caudal part of the postoblongata is expanded into an irregular triangular fossa, the metacœle or caudal part of the fourth ventricle. 1892 Philos. Trans. 1891 (Royal Soc.) B. 182 121/2 Metacœle (4th ventricle). 1995 Larousse Dict. Sci. & Technol. 694/1 Metacoele, in Craniata, the cavity of the hind~brain; the fourth ventricle. 3. Zoology. Usually in form metacoel. The most posterior division of the coelomic cavity of a hemichordate or lophophorate. Also: the somatocoel of an echinoderm. ΚΠ 1947 T. Gislén in Zoologiska Bidrag från Uppsala 25 405 A being which had fixed itself with the front end on the bottom or which crept on the front end had..already advanced far in the reduction of its right foremost coelom...The other two pairs of coeloms, the hydrocoeles (collar coeloms) and somatocoeles or, more neutrally, the meso- and metacoeles, may have been relatively unaffected. 1955 L. H. Hyman Invertebrates IV. xv. 692 It was Heider (1912) who proposed for these three paired sacs the names axocoel, hydrocoel, and somatocoel; Gislén (1947) has suggested the more general terms protocoel, mesocoel, and metacoel. 1967 C. P. Hickman Biol. Invertebr. xxix. 611/2 The coelom of hemichordates is divided into three segments: the proboscis, or protocoel, with a single cavity; the collar, or mesocoel, with two cavities; and the trunk, or metacoel, with two cavities. 1987 M. S. Laverack & J. Dando Lect. Notes Invertebr. Zool. (ed. 3) xxviii. 165/1 The major body cavity [of a bryozoan] is the metacoel (in the metasome). 1994 E. E. Ruppert & R. D. Barnes Invertebr. Zool. (ed. 6) xvii. 868/1 A pair of metacoels is found in the trunk [of an acorn worm]. This entry has been updated (OED Third Edition, December 2001; most recently modified version published online March 2022). < n.1884
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