• Webster's Revised Unabridged Dictionary
    • a Subopercular (Anat) Situated below the operculum; pertaining to the suboperculum.
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Century Dictionary and Cyclopedia
    • subopercular Composing a lower part of the operculum or gill-flap of a fish; pertaining to a suboperculum in any sense, or having its character. See cut under opercular.
    • n subopercular In ichthyology, the suboperculum.
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In literature:

This bone is associated with the postorbital, subopercular and lacrimojugal on no.
"A New Genus of Pennsylvania Fish (Crossoperygii, Coelacanthiformes) from Kansas" by Joan Echols