micromeren.

Brit.

/ˈmʌɪkrə(ʊ)mɪə/, U.S.

/ˈmaɪkroʊˌmɪ(ə)r/

Origin: Formed within English, by compounding. Etymons: micro- comb. form, -mere comb. form.

Etymology: < micro- comb. form + -mere comb. form. Compare ancient Greek μικρομερής consisting of small parts. Compare also French micromère (1893; 1840 as adjective in sense ‘having small parts of the body’). Compare macromere n.

Embryology.

A relatively small blastomere formed by unequal segmentation in the fertilized ovum, such as one of those found at the animal pole of an amphibian ovum. Cf. macromere n.

ΘΚΠ

the world > life > biology > biological processes > procreation or reproduction > embryo or fetus > [noun] > blastula

periblastula1876

macromere1877

micromere1877

blastula1887

amphiblastula1888

1877 T. H. Huxley Man. Anat. Invertebrated Animals viii. 483 The vitellus divides into two unequal masses, of which the larger is termed by Rabl the ‘vegetative’ and the smaller the ‘animal’ cell, somewhat inconvenient names which may be replaced by ‘macromere’ and ‘micromere’.

1886 Jrnl. Royal Microsc. Soc. 6 224 The segmentation resembles that of other molluscs, the ‘micromeres’ appearing at the formative pole by separation of the ‘protoplasmic’ portion of the ‘macromeres’.

1909 J. W. Jenkinson Exper. Embryol. 185 In the next stage the clear vegetative cells derived (presumably) from the micromeres wander in to form the primary mesenchyme.

1969 R. F. Chapman Insects xviii. 349 In Hypogastrura cleavage is unequal with the formation of micro- and macro-meres.

1984 L. W. Browder Developmental Biol. (ed. 2) x. 444 This [unequal division] produces four small cells, the micromeres, clustered at the vegetal pole and four large cells, the macromeres.

1995 Proc. National Acad. Sci. U.S.A. 92 8180 Only the four micromeres that arise at the vegetal pole [of the sea urchin embryo] at the fourth division appear to be autonomously specified.

Derivatives

† micromeral adj. Obsolete rare of or relating to a micromere or micromeres.

ΚΠ

1877 T. H. Huxley Man. Anat. Invertebrated Animals viii. 498 The edges of the micromeral layer.

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

单词	micromere
释义	micromeren. Brit. /ˈmʌɪkrə(ʊ)mɪə/, U.S. /ˈmaɪkroʊˌmɪ(ə)r/ Origin: Formed within English, by compounding. Etymons: micro- comb. form, -mere comb. form. Etymology: < micro- comb. form + -mere comb. form. Compare ancient Greek μικρομερής consisting of small parts. Compare also French micromère (1893; 1840 as adjective in sense ‘having small parts of the body’). Compare macromere n. Embryology. A relatively small blastomere formed by unequal segmentation in the fertilized ovum, such as one of those found at the animal pole of an amphibian ovum. Cf. macromere n. ΘΚΠ the world > life > biology > biological processes > procreation or reproduction > embryo or fetus > [noun] > blastula periblastula1876 macromere1877 micromere1877 blastula1887 amphiblastula1888 1877 T. H. Huxley Man. Anat. Invertebrated Animals viii. 483 The vitellus divides into two unequal masses, of which the larger is termed by Rabl the ‘vegetative’ and the smaller the ‘animal’ cell, somewhat inconvenient names which may be replaced by ‘macromere’ and ‘micromere’. 1886 Jrnl. Royal Microsc. Soc. 6 224 The segmentation resembles that of other molluscs, the ‘micromeres’ appearing at the formative pole by separation of the ‘protoplasmic’ portion of the ‘macromeres’. 1909 J. W. Jenkinson Exper. Embryol. 185 In the next stage the clear vegetative cells derived (presumably) from the micromeres wander in to form the primary mesenchyme. 1969 R. F. Chapman Insects xviii. 349 In Hypogastrura cleavage is unequal with the formation of micro- and macro-meres. 1984 L. W. Browder Developmental Biol. (ed. 2) x. 444 This [unequal division] produces four small cells, the micromeres, clustered at the vegetal pole and four large cells, the macromeres. 1995 Proc. National Acad. Sci. U.S.A. 92 8180 Only the four micromeres that arise at the vegetal pole [of the sea urchin embryo] at the fourth division appear to be autonomously specified. Derivatives † micromeral adj. Obsolete rare of or relating to a micromere or micromeres. ΚΠ 1877 T. H. Huxley Man. Anat. Invertebrated Animals viii. 498 The edges of the micromeral layer. This entry has been updated (OED Third Edition, December 2001; most recently modified version published online March 2022). < n.1877
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