paranucleusn.
/ˌparəˈnjuːklɪəs/, U.S. /ˌpɛrəˈn(j)ukliəs/ Cell Biology.
A small body situated beside or resembling the nucleus of a cell; a nebenkern.
ΘΚΠ
the world > life > biology > substance > cell > cell organelle or contents > [noun] > nucleus > nucleolus or paranucleus
nucleolus1839
nucleole1864
paranucleus1878
plasmasome1889
1878 E. R. Lankester in tr. C. Gegenbaur Elem. Compar. Anat. Pref. p. viii Conjugation in the Infusoria is attended by a definite breaking-up of the nucleus and so-called nucleolus (paranucleus) of the conjugating individuals.
1888 G. Rolleston & W. H. Jackson Forms Animal Life (ed. 2) 255 The nucleus or endoplast, and paranucleus or endoplastule, sometimes erroneously termed nucleolus.
1928 E. L. Opie in E. V. Cowdry Special Cytol. I. ix. 246 The name ‘nebenkern’ or ‘paranucleus’ has been given to structures situated within the cytoplasm [of the pancreatic acinous cell] and staining like nuclear material.
1954 Sci. Monthly Nov. 282/2 (caption) Elimination of the paranucleus—a small cell eliminated by an enlarged germ cell as the first step before it develops into an infusorigen.
1980 Q. Rev. Biol. 55 155/1 Several authors have used the term ‘pseudogerm’ to refer to cells derived from the paranucleus of the eggs.
1993 Zool. Sci. 10 457/1 Each smaller daughter cell loses its cytoplasm and becomes just a nucleus, known as a paranucleus.
Derivatives
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1890 Cent. Dict. 4281/2 Paranucleate, provided with a paranucleus: as, a paranucleate cell.
This entry has been updated (OED Third Edition, June 2005; most recently modified version published online March 2022).
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n.1878