periblasticadj.
/ˌpɛrɪˈblastɪk/, U.S. /ˌpɛrəˈblæstɪk/ Embryology.† 1. Of, relating to, or designating a type of meroblastic development in which cleavage takes place at the surface of the ovum. Obsolete. rare.
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the world > life > biology > biological processes > procreation or reproduction > reproductive substances or cells > [adjective] > ovum > types of ovum
orthotropal1832
meroblastic1864
periblastic1876
holoblastic1879
orthotropous1880
telolecithal1880
progamous1885
teleplasmic1886
triovulate1891
1876 E. R. Lankester in Q. Jrnl. Microsc. Sci. 16 62 The periblastic mode of development is most common in the Arthropods, in Tracheata as well as Crustacea... The essential point about the periblastic type is this, that the food-material collects at an early stage of development centrally, so as to be completely enveloped by the formative protoplasm.
2. Of, relating to, or of the nature of a periblast.
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the world > life > biology > biological processes > procreation or reproduction > reproductive substances or cells > [adjective] > ovum > protoplasm or cytoplasm
periblastic1886
ooplasmic1905
1886 Amer. Naturalist 20 473 A very thin layer of plasma which is obviously homologous with the cortical or periblastic layer of the teleostean egg.
1915 Proc. National Acad. Sci. U.S.A. 1 558 The cavity in many of the hearts is almost if not entirely obliterated by the presence of periblastic material and huge amorphous periblast nuclei.
1980 Réproduction, Nutrition, Développement 20 1517 The aspect of the margin of the embryonic disc indicates that new enveloping blastomeres are forming from the periblastic syncitium.
This entry has been updated (OED Third Edition, December 2005; most recently modified version published online March 2022).
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adj.1876