Etymology
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Words related to cyto-

*(s)keu- 

Proto-Indo-European root meaning "to cover, conceal."

It forms all or part of: chiaroscuro; cunnilingus; custody; cutaneous; cuticle; -cyte; cyto-; hide (v.1) "to conceal;" hide (n.1) "skin of a large animal;" hoard; hose; huddle; hut; kishke; lederhosen; meerschaum; obscure; scum; skewbald; skim; sky.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit kostha "enclosing wall," skunati "covers;" Greek kytos "a hollow, vessel," keutho "to cover, to hide," skynia "eyebrows;" Latin cutis "skin," ob-scurus "dark;" Lithuanian kiautas "husk," kūtis "stall;" Armenian ciw "roof;" Russian kishka "gut," literally "sheath;" Old English hyd "a hide, a skin," hydan "to hide, conceal; Old Norse sky "cloud;" Old English sceo "cloud;" Middle High German hode "scrotum;" Old High German scura, German Scheuer "barn;" Welsh cuddio "to hide."

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-cyte 
word-forming element used in modern science to mean "of a cell," from Latinized form of Greek kytos "a hollow, receptacle, basket" (see cyto-).
cytology (n.)

"the study of the cells of organisms," 1857, from cyto- "cell" + -logy. Related: Cytologist (1884); cytological.

cytoplasm (n.)

"protoplasm, organic substance forming the essential constituent of cells," 1870, from cyto- "cell" + -plasm. Related: Cytoplasmic.

cytosine (n.)

crystalline base which is one of the constituents of nucleic acids, 1894, from German cytosin (1894), from cyto- "cell" + -ose + chemical suffix -ine (2). "The name cytosine (due to Kossel and Neumann) is misleading. Cytosine is not, like adenosine and guanosine, a nucleoside but the sugar-free base." [Flood]

cytotoxic (adj.)

"poisonous to cells," 1902, from cyto- + toxic. Related: Cytotoxin(1900); cytotoxicity.

syncytial (adj.)
1895, "pertaining to a syncytium" (1877), Modern Latin, from Greek syn "together" (see syn-) + kytos "receptacle, vessel," used in biology for "cell" (see cyto-).