mesodermn.

Brit.

/ˈmɛsə(ʊ)dəːm/, U.S.

/ˈmɛzəˌdərm/; see also meso- comb. form.

Forms: also with capital initial.

Origin: Formed within English, by compounding. Etymons: meso- comb. form, -derm comb. form.

Etymology: < meso- comb. form + -derm comb. form. In sense 2 after German Mesoderma (1872 or earlier). Compare French mésoderme (1855 in botanical use, 1877 in sense 2).

†1. Botany.

a. The middle layer of tissue in the outer wall of the spore capsule of a moss. Obsolete. rare.

ΚΠ

1866 J. Lindley & T. Moore Treasury Bot. II. 738/2 Mesoderm, the middle layer of tissue in the shell of the spore-case of an urn-moss.

b. The middle layer of the bark of a tree. Obsolete. rare.

ΚΠ

1891 New Sydenham Soc. Lexicon Mesoderm, in Botany, the middle layer of the bark.

2. Embryology. The middle of the three germinal layers of the embryo (in all metazoans except sponges and coelenterates), from which the body's connective tissues are derived.

ΘΚΠ

the world > life > biology > biological processes > procreation or reproduction > embryo or fetus > embryo parts > [noun] > membrane and layers of cells

germinal layer1836

cell layer1843

mucous layer1846

germ layer1855

mesoblast1857

blastoderm1859

head fold1873

mesoderm1873

epiblast1875

hypoblast1875

splanchnopleure1875

mesenchyme1881

acroblast1884

mesothelium1886

epimere1890

mesectoderm1894

mesendoderm1894

cœloblast1895

placode1907

shield1913

mesentoderm1921

meristoderm1945

bilayer1962

1873 E. R. Lankester in Proc. Royal Soc. 21 78 It is perhaps of some significance that Hæmoglobin has only been found in that great group of the animal kingdom which in the course of its development gives rise to a middle layer of blastodermic cells or mesoderm.

1884 Q. Jrnl. Microsc. Sci. 24 90 To determine the part played by wandering mesoderm cells immediately below the thin ectoderm.

1947 A. D. Imms Outl. Entomol. (ed. 3) iii. 82 Others claim that there is no true endoderm in insects and consequently the inner layer is the equivalent of only the mesoderm of other animals.

1960 D. C. Braungart & R. Buddeke Introd. Animal Biol. (ed. 5) viii. 98 The presence of mesoderm in an organism makes possible the development of a coelom or body cavity, a structure not possible in a diploblastic animal.

1989 B. Alberts et al. Molecular Biol. Cell (ed. 2) xvi. 887 In general, the mesoderm gives rise to the connective tissues of the body.

1998 L. Margulis & K. V. Schwartz Five Kingdoms (ed. 3) iii. 228/1 The flatworm middle tissue layer—a loose mesoderm called parenchyma—never splits into a cavity (coelom) in which internal organs are suspended.

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

单词	mesoderm
释义	mesodermn. Brit. /ˈmɛsə(ʊ)dəːm/, U.S. /ˈmɛzəˌdərm/; see also meso- comb. form. Forms: also with capital initial. Origin: Formed within English, by compounding. Etymons: meso- comb. form, -derm comb. form. Etymology: < meso- comb. form + -derm comb. form. In sense 2 after German Mesoderma (1872 or earlier). Compare French mésoderme (1855 in botanical use, 1877 in sense 2). †1. Botany. a. The middle layer of tissue in the outer wall of the spore capsule of a moss. Obsolete. rare. ΚΠ 1866 J. Lindley & T. Moore Treasury Bot. II. 738/2 Mesoderm, the middle layer of tissue in the shell of the spore-case of an urn-moss. b. The middle layer of the bark of a tree. Obsolete. rare. ΚΠ 1891 New Sydenham Soc. Lexicon Mesoderm, in Botany, the middle layer of the bark. 2. Embryology. The middle of the three germinal layers of the embryo (in all metazoans except sponges and coelenterates), from which the body's connective tissues are derived. ΘΚΠ the world > life > biology > biological processes > procreation or reproduction > embryo or fetus > embryo parts > [noun] > membrane and layers of cells germinal layer1836 cell layer1843 mucous layer1846 germ layer1855 mesoblast1857 blastoderm1859 head fold1873 mesoderm1873 epiblast1875 hypoblast1875 splanchnopleure1875 mesenchyme1881 acroblast1884 mesothelium1886 epimere1890 mesectoderm1894 mesendoderm1894 cœloblast1895 placode1907 shield1913 mesentoderm1921 meristoderm1945 bilayer1962 1873 E. R. Lankester in Proc. Royal Soc. 21 78 It is perhaps of some significance that Hæmoglobin has only been found in that great group of the animal kingdom which in the course of its development gives rise to a middle layer of blastodermic cells or mesoderm. 1884 Q. Jrnl. Microsc. Sci. 24 90 To determine the part played by wandering mesoderm cells immediately below the thin ectoderm. 1947 A. D. Imms Outl. Entomol. (ed. 3) iii. 82 Others claim that there is no true endoderm in insects and consequently the inner layer is the equivalent of only the mesoderm of other animals. 1960 D. C. Braungart & R. Buddeke Introd. Animal Biol. (ed. 5) viii. 98 The presence of mesoderm in an organism makes possible the development of a coelom or body cavity, a structure not possible in a diploblastic animal. 1989 B. Alberts et al. Molecular Biol. Cell (ed. 2) xvi. 887 In general, the mesoderm gives rise to the connective tissues of the body. 1998 L. Margulis & K. V. Schwartz Five Kingdoms (ed. 3) iii. 228/1 The flatworm middle tissue layer—a loose mesoderm called parenchyma—never splits into a cavity (coelom) in which internal organs are suspended. This entry has been updated (OED Third Edition, September 2001; most recently modified version published online March 2022). < n.1866
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