Webster’s Revised Unabridged Dictionary · 1913
Preoperculum
Pre′o·per′cu·lum (·lŭm), n. [NL.] (Anat.) The anterior opercular bone in fishes.
Webster’s Revised Unabridged Dictionary · 1913
Pre′o·per′cu·lum (·lŭm), n. [NL.] (Anat.) The anterior opercular bone in fishes.