Something that pulls apart or divulges; specifically, a surgical instrument used to separate tissues.
From Latin divellere + -or (agent suffix). In anatomy and surgery, -or is commonly used to name instruments or things that perform actions.
A divulsor is a specific surgical tool that doctors use to separate tissues during operations—the name tells you exactly what it does, which is the medical tradition of naming instruments after their function.
Complete word intelligence in one call. Free tier — 50 lookups/day.