transilluminate

1 of 2

verb

transilluminated; transilluminating; transilluminates

transitive verb

: to cause light to pass through
especially : to pass light through (a body part) for medical examination

transilluminator

2 of 2

noun

: an instrument for effecting transillumination

Word History

First Known Use

Verb

1890, in the meaning defined above

Time Traveler
The first known use of transilluminate was in 1890

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Cite this Entry

“Transilluminate.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/transilluminate. Accessed 7 Jul. 2026.

Medical Definition

transilluminate

transitive verb
transilluminated; transilluminating
: to cause light to pass through
especially : to pass light through (a body part) for medical examination
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