cytochalasinPronunciation: /ˌsʌɪtəʊkəˈleɪsɪn/Definition of cytochalasin noun [mass noun] Biochemistry any of a group of polycyclic compounds produced by fungi, used experimentally in research for their property of interfering with cell processes. Origin: 1960s: from cyto- 'cell' + Greek khalasis 'dislocation'cytochalasin in other Oxford dictionaries Definition of cytochalasin in the US English dictionary