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metathesis

noun pl. metatheses

transposition or interchange; specif.,
  1. the transposition of sounds in a word or between words: “clasp” developed from Middle English “clapse” by metathesis; spoonerisms are examples of metathesis
  2. Chem. the interchange of elements or radicals between compounds, as when two compounds react with each other to form two new compounds

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See metathesis in American Heritage Dictionary 4

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