one of a series of slit openings in the pharynxes of fishes and aquatic amphibians through which water passes

one of a series of slit openings in the pharynxes of fishes and aquatic amphibians through which water passes

one of a series of slit openings in the pharynxes of fishes and aquatic amphibians through which water passes

one of a series of slit openings in the pharynxes of fishes and aquatic amphibians through which water passes

one of a series of slit openings in the pharynxes of fishes and aquatic amphibians through which water passes

one of a series of slit openings in the pharynxes of fishes and aquatic amphibians through which water passes

one of a series of slit openings in the pharynxes of fishes and aquatic amphibians through which water passes

one of a series of slit openings in the pharynxes of fishes and aquatic amphibians through which water passes

a depression scratched or carved into a surface

a piece of armor plate (with eye slits) fixed or hinged to a medieval helmet to protect the face