Definition of protopathic in English:

protopathic

adjective

Physiology
  • Relating to or denoting those sensory nerve fibres of the skin which are capable of discriminating only between relatively coarse stimuli, chiefly heat, cold, and pain.

    Often contrasted with epicritic
    • ‘An alternate explanation for the finding is protopathic bias, which can arise in situations where medications are used to treat acute symptoms.’

Origin

Mid 19th century: from proto- ‘primitive’ + Greek pathos suffering, feeling + -ic.

Pronunciation:

protopathic

/ˌprəʊtə(ʊ)ˈpaθɪk/