The Collaborative International Dictionary
Mesobranchial
Mesobranchial \Mes`o*bran"chi*al\, a. [Meso- + branchial.] (Zo["o]l.) Of or pertaining to a region of the carapace of a crab covering the middle branchial region.
Wiktionary
mesobranchial
a. (context zoology English) Of or pertaining to a region of the carapace of a crab covering the middle branchial region.