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leucotome

[loo-kuh-tohm]
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noun Surgery.
  1. an instrument for dissecting the white matter of the brain, consisting of a cannula containing a slender rotating blade.
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Origin of leucotome

First recorded in 1935–40; leuco- + -tome
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018