What is "pterotic"

Pterotic \Pte*ro"tic\, a. [Gr. ? wing + ?, ?, ear.] (Anat.) Of or pertaining to, or designating, a bone between the pro["o]tic and epiotic in the dorsal and outer part of the periotic capsule of many fishes. -- n. The pterotic bone.

Note: The pterotic bone is so called because fancied in some cases to resemble in form a bird's wing

a. (context anatomy English) Of or relating to a bone between the prootic and epiotic in the dorsal and outer part of the periotic capsule of many fishes. n. The pterotic bone.