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Douglas Harper's Etymology Dictionary
cyto-

before a vowel, cyt-, word-forming element, Latinized comb. form of Greek kytos "a hollow, receptacle, basket" (from PIE *ku-ti-, from root *(s)keu- "to cover, conceal;" see hide (n.1)); used in modern science since c.1859 for "cell," perhaps especially from the sense (in Aristophanes) of "a cell of a hive of wasps or bees."

Wiktionary
cyto-

pre. (context biology English) Forming words regarding or pertaining to cells.