noun
a small hole made by or as if by a pin
adjective
describing something related to or resembling a pinhole
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The photographer used a pinhole camera to capture the image.
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I made a pinhole projector out of a shoebox to watch the solar eclipse.
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I tried to take a pinhole selfie but it didn't turn out so great.
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The pinhole of light in the tunnel gave us hope that we were nearing the end.