单词 | poikiloblast |
释义 | poikiloblastn. 1. Medicine. An erythroblast of irregular shape; an immature poikilocyte. Now rare. ΚΠ 1890 G. M. Gould New Med. Dict. 119/2 Corpuscles of the blood have been distinguished, according to their size—into normoblasts,..megaloblasts,..mikroblasts,..and poikiloblasts, of irregular shape and size. 1898 A. C. Coles Blood 49 Megaloblasts and normoblasts may undergo poikilocytosis, constituting poikiloblasts. 1909 Lancet 6 Feb. 378 The extraordinary number of nucleated red cells, chiefly normoblasts, though a few megaloblasts and poikiloblasts were also present. 2. Geology. A large crystal in a metamorphic rock containing inclusions or small grains of other minerals. ΘΚΠ the world > the earth > minerals > mineral structure or appearance > [noun] > crystal structure > specific crystal chromitite1910 idioblast1920 poikiloblast1944 the world > the earth > structure of the earth > constituent materials > rock > texture or colour > [noun] > texture > having embedded crystals > crystalline substance in mica1681 kernel1839 phenocryst1889 idioblast1920 porphyroblast1920 porphyroclast1932 poikiloblast1944 1944 Trans. Royal Soc. Edinb. 61 225 Accessories are apatite and sphene,..the latter in rounded red-brown pleochroic poeciloblasts in the same minerals. 1969 A. Spry Metamorphic Textures 169 (heading) Poikiloblasts. 1989 Jrnl. Petrol. 30 42 Subhedral poikiloblasts enclosing quartz and biotite are volumetrically dominant, but garnet also occurs as anhedral intergrowths with biotite. 2001 Jrnl. Asian Earth Sci. 19 54 Garnet porphyroblasts are common in the phyllites of Kuncha Formation, and are typically poikiloblasts, mostly with inclusion-free rims. This entry has been updated (OED Third Edition, September 2006; most recently modified version published online March 2022). < n.1890 |
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