thiosemicarbazide
noun
thio·semi·car·ba·zide
| \ ˌthī-ō-ˌsem-i-ˈkär-bə-ˌzīd
\
\
Medical Definition of thiosemicarbazide
: a crystalline compound CH5N3S that is the analog of semicarbazide in which oxygen is replaced by sulfur