Definition of preopercular in US English:

preopercular

noun

Ichthyology
  • = preoperculum.

adjective

Ichthyology
  • Of or relating to the preoperculum.

Origin

Mid 19th century. As noun from pre- + opercular; compare earlier preoperculum. As adjective from pre- + opercular, after preoperculum.

Pronunciation

preopercular

/ˌpriːə(ʊ)ˈpəːkjʊlə/