LATIN DICTIONARYLexicon Latīnum
nounthird declension

caput mortuum

caput mortuum n (genitive capitis mortuum)

Meaning

  1. neutera dead man's head, a skull
  2. neuterworthless residue, useless substance
    1591 "Caput mortuum, ut est apud Paracelsum, sign. materias, quae sunt in fundo vasis chimici" (Antonio Ricciardo, Commentaria symbolica, p. 138)
  3. neuterCardinal purple, a variety of haematite iron oxide pigment

Declension

declension
formsingularplural
nominativecaput mortuumcapita mortua
genitivecapitis mortuīcapitum mortuōrum
dativecapitī mortuōcapitibus mortuīs
accusativecaput mortuumcapita mortua
ablativecapite mortuōcapitibus mortuīs
vocativecaput mortuumcapita mortua

Origins

Literally, “dead head”. Figurative use from alchemical literature.

Quick answers

What does caput mortuum mean in Latin?
caput mortuum, a noun, means “a dead man's head, a skull; worthless residue, useless substance; Cardinal purple, a variety of haematite iron oxide pigment”.
What is the genitive of caput mortuum?
The genitive singular is capitis mortuum. caput mortuum is third declension.