centrospheren.
/ˈsɛntrə(ʊ)sfɪə/, U.S. /ˈsɛntrəˌsfɪ(ə)r/ΚΠ
1884 C. T. Bayrhoffer in Radical Rev. 19 Apr. 8/1 The last elements of being are centro-spheres of a determined intensity and extensity.
2. Cell Biology. A mass of cytoplasm from which the asters extend during cell division and within which the centrosome lies when present; also called attraction sphere.
ΘΚΠ
the world > life > biology > biological processes > genetic activity > genetic components > [noun] > chromosome > centrosphere
attraction sphere1875
astrosphere1893
centrosphere1893
1893 J. E. Humphrey tr. A. Zimmermann Bot. Microtechnique 198 After the presence of the so-called centrospheres..or attractive spheres had been recognized in animal cells.., Guignard..succeeded in observing them in various plant-cells also.
1896 E. B. Wilson Cell 232 The centrosphere has a radiate structure, being traversed by rays which stretch between the centrosome and the peripheral microsome-circle.
1913 W. E. Kellicott Textbk. Gen. Embryol. ii. 39 A medullary region forming a small spheroidal mass called the centrosphere or attraction sphere immediately surrounds the centrosome.
1960 L. Picken Organization of Cells vii. 253 In experiments in which removal of the centrosphere alone was attempted, asters always re-formed eventually.
2004 G. Majno & I. Joris Cells, Tissues, & Dis. (ed. 2) xiii. 462/2 The peripheral arrangement is caused by a giant centrosphere in the middle of the cell.
3. Geology. The innermost region of the earth. Also used of various individual layers of which the interior of the earth has been considered to be composed. Cf. barysphere n. Now largely disused.
ΘΚΠ
the world > the earth > structure of the earth > [noun] > geosphere > centrosphere or core
centre1483
middle eartha1592
mid-earth1849
core1882
centrosphere1898
Nife1909
1898 J. W. Powell in Jrnl. Geol. (Chicago) 6 2 For the sake of clearer distinction, these spheres may be called (1) the centrosphere, (2) the lithosphere, (3) the hydrosphere, (4) the atmosphere... The centrosphere is the chief mass and has a density of 5.6.
1915 C. Schuchert Text-bk. Geol. II. xxi. 456 The vast central mass of the earth, the centrosphere, consists of unknown material surrounded by a thick earth-shell, the asthenosphere.
1932 Philosophy 7 290 Next to the centrosphere is the lithosphere, a thick layer of basic rock, consisting of a complex mixture of silicates.
1988 S. W. Carey Theories of Earth & Universe (Glossary) 370 The asthenosphere separates the lithosphere above from the centrosphere or mantle below.
2010 M. K. Theodore & L. Theodore Introd. Environmental Managem. ix. 109 The barysphere, sometimes called the centrosphere, is below the lithosphere.
This entry has been updated (OED Third Edition, June 2016; most recently modified version published online December 2021).
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n.1884