preopercular
/ˌpriːə(ʊ)ˈpəːkjʊlə/Ichthyol.
noun
= preoperculum.
adjective
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.