What do a.m. and p.m. stand for?

pinhole camera

a simple camera in which an aperture provided by a pinhole in an opaque diaphragm is used in place of a lens.
Origin of pinhole camera
1890-95 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for pinhole camera
  • Basically a pinhole camera which records the sun's arc across the sky for six months.
  • Cooling for this mesh must come from the boundary of the pinhole camera pinhole.
  • Let students know that the image of the sun with the pinhole camera will be small.
British Dictionary definitions for pinhole camera

pinhole camera

a camera with a pinhole as an aperture instead of a lens
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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