a small hole made by or as by a pin.
a hole for a pin to go through; tiny aperture.

1670–80; pin + hole Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
pinhole (ˈpɪnˌhəʊl)
1.  a small hole made with or as if with a pin
2.  archery the exact centre of an archery target, in the middle of the gold zone

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
Chameleons' eyelids are fused together, leaving only a pinhole open over the pupil.
The set linked to above also has a pinhole attachment that fixes the aperture, forcing you to adjust shutter speed to compensate.
Light that does not go in exactly the right direction does not make it through the pinhole, and so cannot blur the image you see.
If x-ray beam is up, scan pinhole to center the pinhole with x-ray.
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