Definition of morbific in US English:

morbific

adjective

dated
  • Causing disease.

    ‘in cholera the morbific matter is taken into the alimentary canal’
    • ‘Heart disease is an affection of the heart brought on by morbific agents turned loose in the blood from imperfect digestion.’
    • ‘In this way morbific agents can be transferred through the feed from animals of one cage to animals in other cages.’
    • ‘They were victims of morbific agents encountered at work.’

Origin

Mid 17th century: from French morbifique or modern Latin morbificus, from Latin morbus ‘disease’.

Pronunciation

morbific

/mɔrˈbɪfɪk//môrˈbifik/