noun.
In sponges, a mouth or principal exhalent aperture; one of the orifices by which water is expelled. See cuts under Porifera and Spongilla.
noun.
One of the suckers, bothria, or fossettes on the head of a tapeworm, by means of which the animal attaches itself to its host.
noun.
A pax: apparently an erroneous abbreviation for osculatorium.