- Abdominal organ - Body organ - Membranous sac - Soccer ball inner - A bag or sac in animals, which serves as the receptacle of
some fluid; as, the urinary bladder; the gall bladder; -- applied
especially to the urinary bladder, either within the animal, or when
taken out and inflated with air. - Any vesicle or blister, especially if filled with air, or
a thin, watery fluid. - A distended, membranaceous pericarp.