%abranchial%

a. (Anat.) Outside of the branchial arches; -- said of the cartilages thus placed in some fishes. [ 1913 Webster ]

a. [ Infra + branchial. ] (Zool.) Below the gills; -- applied to the ventral portion of the pallial chamber in the lamellibranchs. [ 1913 Webster ]

a. [ Meta- + branchial. ] (Zool.) Of or pertaining to the lobe of the carapace of crabs covering the posterior branchiae. [ 1913 Webster ]