Definition of caput mortuum
1 alchemy : the residuum after distillation or sublimation
2 : dross : worthless residue
3 or caput mortuum vitrioli \-ˌvi‧trēˈōˌlē, -ī\ : a red iron-oxide pigment made by calcining iron sulfate
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Origin and Etymology of caput mortuum
New Latin, literally, dead head
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