One of the mysteries of the English language finally explained.
A tool for enlarging holes; = "reamer".
A tool or machine for making or ornamenting the rim of a pie, pastry, etc. Frequently with preceding word, especially as "pie rimmer".
Early 19th century. Either from rim + -er, or perhaps a variant of reamer<br>mid 19th century; earliest use found in U.S. Patents. From rim + -er.
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