A small opening or orifice.
Of or pertaining to the mouth.
One of the suckers on the head of a tapeworm.
(zoology) The main opening in a sponge from which water is expelled.
Same as Oscule.
The osculum (plural ) is an excretory structure in the living sponge, a large opening to the outside through which the current of water exits after passing through the spongocoel. Wastes diffuse into the water and the water is pumped through the osculum carrying away with it the sponge's wastes.