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biprism

[bahy-priz-uh m] /ˈbaɪˌprɪz əm/
noun, Optics.
1.
a triangular prism with an apex angle slightly less than 180°: when illuminated by a point source of light it produces two overlapping beams that form an interference pattern on a screen.
Also called Fresnel biprism.
Origin
1880-1885
1880-85; bi-1 + prism
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for bi prism

biprism

/ˈbaɪˌprɪzəm/
noun
1.
a prism having a highly obtuse angle to facilitate beam splitting
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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