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borescope

[bawr-skohp, bohr-]
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noun Optics.
  1. an instrument using optical fibers for the visual inspection of narrow cavities, as the bore of a gun.
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Origin of borescope

First recorded in 1955–60; bore2+ -scope
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018