Extrabranchial :: Extrabranchial (a.) Outside of the branchial arches; -- said of the cartilages thus placed in some fishes.
Infrabranchial :: Infrabranchial (a.) Below the gills; -- applied to the ventral portion of the pallial chamber in the lamellibranchs.
Metabranchial :: Metabranchial (a.) Of or pertaining to the lobe of the carapace of crabs covering the posterior branchiae.
Suprabranchial :: Supra-axillary (a.) Growing above the axil; inserted above the axil, as a peduncle. See Suprafoliaceous..
Tetrabranchiata :: Tetrabranchiata (n. pl.) An order of Cephalopoda having four gills. Among living species it includes only the pearly nautilus. Numerous genera and species are found in the fossil state, such as Ammonites, Baculites, Orthoceras, etc..
Tetrabranchiate :: Tetrabranchiate (a.) Of or pertaining to the Tetrabranchiata.