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cytozoon
cytozoon n. 
/ˌsʌɪtəˈzəʊɒn/,
Brit. /ˌsʌɪtəˈzəʊən/
, /ˌsʌɪtəˈzəʊən//ˌsʌɪtəˈzəʊɒn/U.S. /ˌsaɪdəˈzoʊˌɑn/
(also cytozoön; plural cytozoa) [after German Cytozoon (plural Cytozoen) (J. Gaule 1881, in Arch. f. Anat. u. Physiol.: Physiol. 297)] now disused any protozoan that is an intracellular parasite, esp. of blood cells./ˌsaɪdəˈzoʊˌɑn/ΘΚΠ
the world > animals > invertebrates > protozoa > [noun] > member of > parasite
cytozoon1882
cephalont1885
cephalin1888
Babesia1900
signet ring1901
giardia1921
1882 E. R. Lankester in Q. Jrnl. Microsc. Sci. 22 54 The word Cytozoa may therefore be better used as a designation descriptive of cell-parasites generally.
1886 Jrnl. Royal Microsc. Soc. 6 ii. 945 The typical cytozoa have a somewhat complicated structure. They contain an unmistakable nucleus, and their protoplasm consists of two portions, on the one hand of a substance occupying the two points of the cytozoon.
1905 Jrnl. Infectious Dis. 2 302 First, it may be held that the flagellates observed by Schaudinn in the mosquito are the real stages of the cytozoön.
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