The Collaborative International Dictionary
Metabranchial
Metabranchial \Met`a*bran"chi*al\, a. [Meta- + branchial.] (Zo["o]l.) Of or pertaining to the lobe of the carapace of crabs covering the posterior branchi[ae].
Wiktionary
metabranchial
a. (context zoology English) Of or pertaining to the lobe of the carapace of crabs covering the posterior branchiae.