Definition of rimmer in US English:

rimmer

noun

US
  • A tool for enlarging holes; = "reamer".

noun

  • A tool or machine for making or ornamenting the rim of a pie, pastry, etc. Frequently with preceding word, especially as "pie rimmer".

Origin

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.

Pronunciation

rimmer

/ˈrɪmə/