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pupilometer

The English word “pupilometer” has 2 meanings listed here.

noun

  1. A device that measures the distance between the pupils of the eyes.
  2. A device that measures the pupil's response to visual stimuli.

Etymology

From pupil + -o- + -meter.

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Definitions are from Wiktionary, extracted by Kaikki.org, and are available under the CC BY-SA 4.0 licence.