The spelling of the phrase "preternatural anus" may seem daunting, but it is easy to decipher with the help of IPA phonetic transcription. Preternatural is pronounced as "pri-ter-nach-er-uhl," while anus is pronounced as "ey-nuhs." The word preternatural refers to something that is inexplicable or beyond normal understanding, whereas anus refers to the opening at the end of the digestive tract. Used together, the phrase describes an act or experience that is exceptionally mysterious or abnormal.
Artificial a.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.