Definition of subopercular in US English:

subopercular

adjective

Zoology
  • Designating a bone in the lower part of the operculum of a fish; of or relating to this bone.

noun

Zoology
  • A subopercular bone; = suboperculum.

Origin

Mid 19th century; earliest use found in Edward Griffith (1790–1858), naturalist. From sub- + opercular, after suboperculum.