One of the mysteries of the English language finally explained.
Of or relating to the peristome of an invertebrate; surrounding the mouth, circumoral.
Of or relating to the region around a surgical stoma.
Mid 19th century; earliest use found in Philosophical Transactions of the Royal Society of London. From peristome + -al<br>1930s; earliest use found in The Lancet. From peri- + stomal.
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