Biprism

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