in·ter·pu·pil·lar·y

[in-ter-pyoo-puh-ler-ee]
adjective Anatomy.
between the pupils of the eyes: interpupillary distance.

Origin:
1905–10; inter- + pupillary2

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Based on the Random House Dictionary, © Random House, Inc. 2013.
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Medical Dictionary

interpupillary in·ter·pu·pil·lar·y (ĭn'tər-py&oomacr;'pə-lěr'ē)
adj.
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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00:10
Interpupillary has a plethora of syllables.
So is pneumonoultramicroscopicsilicovolcanoconiosis. Does it mean:
a white, crystalline, water-insoluble, powerful high explosive, C3H6N6O6, used chiefly in bombs and shells.
an obscure term ostensibly referring to a lung disease caused by silica dust, sometimes cited as one of the longest words in the English language.
Example sentences
Adjust the oculars for interpupillary distance so that when looking with both eyes only one circle of light is seen.
It can be adjusted according to the interpupillary distance of the observer.
Adjust interpupillary distance until the left and right images merge.
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