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The anal pore or cytoproct is a structure in various single-celled eukaryotes where waste is ejected after the nutrients from food have been absorbed into the cytoplasm. In ciliates, the anal pore (cytopyge) and cytostome are the only regions of the pellicle that are not covered by ridges, cilia or rigid covering. They serve as analogues of, respectively, the anus and mouth of multicellular. Anal pore definition is - an opening on the exterior surface of an animal (such as a fish, nematode, or paramecium) through which undigested food, water, or gas is expelled. Wonder what anal sex is like? You can either try it or learn from these 12 women, who spilled the dirty details about having butt sex for the very first time. Anal pore (plural anal pores) the normal physical exit area for undigested solid food in living beings. Pimples can form on the anus typically when one or more pores become clogged with oil and dead skin cells.