a crystalline, slightly water-soluble solid, C
6H
5NHCSNH
2, that is either tasteless or bitter, depending upon the heredity of the taster, and is used in medical genetics and as a diagnostic.
Abbr.: PTC Also called
phen`yl•thi`o•u•re′a (-yʊˈri ə, -ˈyʊər i ə)