This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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adj. Of, relating to, or resembling the gills of a fish, their homologous embryonic structures, or the derivatives of their homologous parts in higher animals: branchial muscles.

adj. Of, pertaining to or resembling gills

adj. Of or pertaining to branchiæ or gills.

Of or pertaining to the branchiæ or gills; or, in animals which have no gills properly so called, of or pertaining to the parts considered homologous with gills, as, in a bird or mammal, parts of the third postoral visceral arch, or of any visceral arch behind the hyoidean.

Performed by means of branchiæ: as, branchial respiration; a branchial function.

In Crustacea, a cavity or space inclosed by the branchiostegite or gill-cover (formed by a free pleural part of the carapace), and bounded internally by the epimera of the branchiferous somites.

adj. of or relating to gills (or to parts of the body derived from embryonic gills)

"The outlet is sometimes called the branchial pore, and sometimes the cloaca or ejection-aperture."

branchial pore    branchial fold    branchial chamber    branchial tuft    branchial pouch    branchial basket    branchial skeleton    branchial sac    branchial ray    branchial pharynx   

masticatory    laced-up    window-like    mountain-like    batching    possible    circular-headed    double-doored    vulvar    flowerlike