adjective Anatomy.
between the pupils of the eyes: interpupillary distance.

1905–10; inter- + pupillary2 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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American Heritage
Medical Dictionary

interpupillary in·ter·pu·pil·lar·y (ĭn'tər-pyōō'pə-lěr'ē)
Occurring between the pupils of the eyes, referring especially to the distance between the pupils.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Adjust the oculars for interpupillary distance so that when looking with both eyes only one circle of light is seen.
Adjust interpupillary distance until the left and right images merge.
It can be adjusted according to the interpupillary distance of the observer.
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