2 definitions found From The Collaborative International Dictionary of English v.0.48 [gcide]: Biprism \Bi"prism\, n. [Pref. bi- + prism.] 1. A prism whose refracting angle is very nearly 180 degrees. [Webster 1913 Suppl.] 2. A combination of two short rectangular glass prisms cemented together at their diagonal faces so as to form a cube; -- called also {optical cube}. It is used in one form of photometer. [Webster 1913 Suppl.] From WordNet (r) 2.0 [wn]: biprism n : an optical device for obtaining interference fringes
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