metasomen.

Brit.

/ˈmɛtəsəʊm/, U.S.

/ˈmɛdəˌsoʊm/

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

Etymology: < meta- prefix + -some comb. form, after metasoma n. In sense 2 after metasomatic adj. or metasomatism n.

1. Zoology. Originally: a metasoma. Later also: the segment of the body of copepods and certain other crustaceans that is situated between the cephalothoracic portion (cephalosome) and the urosome, anterior to the body's major articulation.

ΚΠ

1883 Ogilvie's Imperial Dict. (new ed.) Metasome, Metasoma, the posterior portion of the body of a cephalopod.

1909 Cent. Dict. Suppl. s.v. Metasome...In some crustaceans, as the amphipods, the first three segments of the pleon or abdomen.

1935 Amer. Midland Naturalist 16 781 Body [of the copepod Modiolicola gracilis] slender, the metasome ovate, moderately dilated and a little flattened.

1956 Ecology 37 584/1 The measurements were taken from the metasome [of the copepod Limnocalanus] only.

1962 D. Nichols Echinoderms xiv. 174 The lophophore itself is borne by the mesosome, and there is a strong partition between this division of the body and the metasome.

1963 G. A. Kerkut Borradaile & Potts's Invertebrata (rev. ed.) 384 It will be seen that the actual tagmata of Cyclops are not the head, thorax, and abdomen,..but are a cephalothorax of eight somites.., a mid body (sometimes, but unsuitably, named the ‘metasome’) of three somites, and a hind body or ‘urosome’ of five somites and the telson.

1991 Jrnl. Crustacean Biol. 11 647 Eudiaptomus yukonensis, new species,..differs from its morphologically similar congener, Eudiaptomus graciloides..in the shape and ornamentation of the wings of the female metasome.

2. Geology. Originally: a mineral or rock formed by metasomatism (now rare). Later: a metasomatized layer of the upper mantle.

ΚΠ

1913 W. Lindgren Mineral Deposits xi. 158 An individual in another may be briefly called a metasome; if the metasome develops strongly with crystal outlines it may be called a metacryst.

1972 Gloss. Geol. (Amer. Geol. Inst.) 447/1 Metasome, (a) The replacing mineral where one mineral grows in size at the expense of another mineral..; a mineral grain formed by metasomatism. (b) The newly formed part of a migmatite or composite rock, introduced by metasomatism.

1986 Eos 67 1263/3 The vapors released at greater depths within this metasome were enriched in H₂0.

1999 Jrnl. Geol. (Chicago) 107 416/2 The topology of the solidus also means the metasome layer is a potentially productive source of magmas.

This is a new entry (OED Third Edition, December 2001; most recently modified version published online March 2022).

单词	metasome
释义	metasomen. Brit. /ˈmɛtəsəʊm/, U.S. /ˈmɛdəˌsoʊm/ Origin: Formed within English, by derivation. Etymons: meta- prefix, -some comb. form. Etymology: < meta- prefix + -some comb. form, after metasoma n. In sense 2 after metasomatic adj. or metasomatism n. 1. Zoology. Originally: a metasoma. Later also: the segment of the body of copepods and certain other crustaceans that is situated between the cephalothoracic portion (cephalosome) and the urosome, anterior to the body's major articulation. ΚΠ 1883 Ogilvie's Imperial Dict. (new ed.) Metasome, Metasoma, the posterior portion of the body of a cephalopod. 1909 Cent. Dict. Suppl. s.v. Metasome...In some crustaceans, as the amphipods, the first three segments of the pleon or abdomen. 1935 Amer. Midland Naturalist 16 781 Body [of the copepod Modiolicola gracilis] slender, the metasome ovate, moderately dilated and a little flattened. 1956 Ecology 37 584/1 The measurements were taken from the metasome [of the copepod Limnocalanus] only. 1962 D. Nichols Echinoderms xiv. 174 The lophophore itself is borne by the mesosome, and there is a strong partition between this division of the body and the metasome. 1963 G. A. Kerkut Borradaile & Potts's Invertebrata (rev. ed.) 384 It will be seen that the actual tagmata of Cyclops are not the head, thorax, and abdomen,..but are a cephalothorax of eight somites.., a mid body (sometimes, but unsuitably, named the ‘metasome’) of three somites, and a hind body or ‘urosome’ of five somites and the telson. 1991 Jrnl. Crustacean Biol. 11 647 Eudiaptomus yukonensis, new species,..differs from its morphologically similar congener, Eudiaptomus graciloides..in the shape and ornamentation of the wings of the female metasome. 2. Geology. Originally: a mineral or rock formed by metasomatism (now rare). Later: a metasomatized layer of the upper mantle. ΚΠ 1913 W. Lindgren Mineral Deposits xi. 158 An individual in another may be briefly called a metasome; if the metasome develops strongly with crystal outlines it may be called a metacryst. 1972 Gloss. Geol. (Amer. Geol. Inst.) 447/1 Metasome, (a) The replacing mineral where one mineral grows in size at the expense of another mineral..; a mineral grain formed by metasomatism. (b) The newly formed part of a migmatite or composite rock, introduced by metasomatism. 1986 Eos 67 1263/3 The vapors released at greater depths within this metasome were enriched in H₂0. 1999 Jrnl. Geol. (Chicago) 107 416/2 The topology of the solidus also means the metasome layer is a potentially productive source of magmas. This is a new entry (OED Third Edition, December 2001; most recently modified version published online March 2022). < n.1883
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