Definition of orthoepical in US English:

orthoepical

adjective

Linguistics
rare
  • Of or relating to orthoepy or pronunciation; = "orthoepic".

Origin

Mid 18th century; earliest use found in Benjamin Martin (bap. 1705, d. 1782), lecturer on science and maker of scientific instruments. From orthoepy + -ical.

Pronunciation

orthoepical

/ˌɔːθəʊˈɛpɪkl/