from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. Of or pertaining to the operculum that covers the gill slits of fish
- n. A branchiostegal ray.
from the GNU version of the Collaborative International Dictionary of English
- adj. Pertaining to the membrane covering the gills of fishes.
from The Century Dictionary and Cyclopedia
- Relating to or of the nature of a branchiostege.
- n. One of the bony rays under the head of a fish below the opercular bones and behind the lower jaw. They are connected by a membrane called the branchiostegal or gill-membrane.
Ancient Greek βράγχιον (brankhion, "gill (used in the plural)") + στέγω (stegō, "cover") + -al (Wiktionary)