1) Unhealthful 
Pertaining to an agent or substance that causes a diseased condition in cells, in contrast to histologic changes; used especially with reference to effects observed in cells in tissue cultures. ... (05 Mar 2000) ... 
Type: Term Pronunciation: sī′tō-path′ō-jen′ik Definitions: 1. Pertaining to an agent or substance that causes a diseased condition in cells, in contrast to histologic changes; used especially with reference to effects observed in cells in tissue cultures.
cytopathogenic Relating to an agent, or substance, that causes a diseased condition in cells, in contrast to histologic changes (microscopic anatomy, as opposed to gross anatomy which involves structures that can be observed with the naked eye); used especially with reference to the effects observed in cells in tissue cultures.
adjective of or relating to or causing pathological changes in cells
of or pertaining to a substance or microorganism that is pathologic for or destructive to cells. · of or pertaining to such cellular changes.