mesomericadj.
/ˌmɛsə(ʊ)ˈmɛrɪk/, U.S. /ˌmɛzoʊˈmɛrɪk/; see also meso- comb. form. 1. Zoology.
a. = mesosomal adj.1 rare.
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1897 A. T. Masterman in Q. Jrnl. Microsc. Sci. 40 332 The mesomeric cœlomic cavities may possibly break down, leaving the trocophoral head-kidneys as mesomeric nephridia.
1900 Amer. Naturalist 34 127 Willey's third proposition as to regional pores and nephric tubules is best presented by copying his own table...[Table] Archimeric system... Protomeric pores... Mesomeric pores... Opisthomeric pores.
b. Relating to a mesomere or mesomeres (mesomere n. 3).
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1915 Proc. Royal Soc. 1914–15 B. 88 473 The origin of the ring vessels..is by no means mesomeric, because the vascular cells are derived, even in the strictly segmented branchial region, from an organ which is not segmented in accordance with the mesodermic somites.
1983 Q. Rev. Biol. 58 2/2 In the trunk the dorsal mesoderm is segmented, whereas the ventral (mesomeric and hypomeric) mesoderm forms unsegmented lateral ridges and sheets.
1999 Developmental Biol. 210 392 (caption) This scheme is shown to be based on mesomeric formulation, in which head cavities of elasmobranch embryos are equated with myotomes.
2. Chemistry. Of, relating to, exhibiting, or arising from mesomerism.
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the world > matter > chemistry > mesomerism > [adjective]
mesomeric1933
1933 C. K. Ingold in Jrnl. Chem. Soc. 1124 The permanent polarisation associated with the tautomeric effect was originally distinguished by the name ‘electronic strain’, but this term has not proved convenient and, on account of considerations indicated later, the designation mesomeric effect is now substituted.
1956 E. de B. Barnett Mechanism Org. Chem. Reactions i. 5 Neither the double-bonded formula nor the dipolar formula is a true representation of the molecule, which must be regarded as a mesomeric hybrid to which both structures contribute.
1973 B. J. Hazzard tr. H. Becker et al. Organicum iii. iv. 146 A mesomeric system may involve not only double and triple bonds between the various bond partners but also free electron pairs conjugated with them.
1993 Dyes & Pigments 21 35 Electronic effects may stabilize the dissociated dye anion by mesomeric or inductive effects.
This entry has been updated (OED Third Edition, September 2001; most recently modified version published online March 2022).
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adj.1897