|hi(ˌ)stōkeməˌgraf, -rȧf noun
Etymology: hist- + chem- + -graph
: a picture or pattern produced on a photographic plate by the chemical action of a histological specimen in contact with the emulsion
• his·to·che·mog·ra·phy -ˌkeˈmägrəfē, -_kə̇ˈ- noun -es