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spheroplast
spheroplast n. 
/ˈsfɪərə(ʊ)plast/, /ˈsfɛrəˌplæst/ [-plast comb. form] Biology a bacterium or plant cell bound by its plasma membrane, the cell wall being deficient or lacking and the whole having a spherical form.
Brit. /ˈsfɪərə(ʊ)plɑːst/
, /ˈsfɪərə(ʊ)plɑːst//ˈsfɪərə(ʊ)plast/U.S. /ˈsfɪrəˌplæst/
, /ˈsfɪrəˌplæst//ˈsfɛrəˌplæst/ΘΚΠ
the world > life > biology > substance > cell > types of cells > [noun] > other types of cells
reticular cell1832
torula1833
reserve cell1842
subcell1844
parenchyma cell1857
pedicel cell1858
nettle cell1870
heterocyst1872
prickle cell1872
angioblast1875
palisade cell1875
sextant1875
spindle cell1876
neuroblast1878
body cell1879
plasma cell1882
reticulum cell1882
stem cell1885
Langhans1886
basal cell1889
pole cell1890
myelocyte1891
statocyst1892
mast cell1893
thrombocyte1893
iridocyte1894
precursor1895
nurse cell1896
amacrine1900
statocyte1900
mononuclear1903
oat cell1903
myeloblast1904
trochoblast1904
adipocyte1906
polynuclear1906
fibrocyte1911
akaryote1920
Rouget cell1922
Sternberg–Reed1922
amphicyte1925
monoblast1925
pericyte1925
promyelocyte1925
pituicyte1930
agamete1932
sympathogonia1934
athrocyte1938
progenitor1938
Reed–Sternberg cell1939
submarginal1941
delta cell1942
mastocyte1947
squame1949
podocyte1954
transformed cell1956
transformant1957
spheroplast1958
pinealocyte1961
immunocyte1963
lactotroph1966
mammotroph1966
minicell1967
proheterocyst1970
myofibroblast1971
cybrid1974
1958 C. Hurwitz et al. Jrnl. Bacteriol. LXXVI. 612/2 Lederberg (1956) has referred to these forms as protoplasts. In view of current uncertainty as to the fate of the cell wall in this case, we shall use ‘spheroplasts’ (McQuillen, 1958, personal communication) as a neutral term.
1958 C. Hurwitz et al. Jrnl. Bacteriol. LXXVI. 613/2 Spheroplasts are osmotically fragile in a hypotonic environment.
1976 Ann. Rev. Microbiol. 30 42 Conversion of these cells to spheroplasts results in the release of periplasmic proteins into the supernatant.
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