Definition of mortific in English:

mortific

Pronunciation /mɔːˈtɪfɪk/

adjective

rare, archaic
  • That causes death; deadly.

Origin

Mid 17th century; earliest use found in Noah Biggs (fl. 1651), medical practitioner and social reformer. From post-classical Latin mortificus from classical Latin mort-, mors death + -ficus. Compare Middle French mortifique.