The Collaborative International Dictionary
Biprism \Bi"prism\, n. [Pref. bi- + prism.]
A prism whose refracting angle is very nearly 180 degrees.
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.
n. 1 (context mathematics English) A fusion of two triangular prisms 2 (context physics English) An optical device of this construction used to generate interference fringes
n. an optical device for obtaining interference fringes
Usage examples of "biprism".
I do know that the generalized Schmitt-Conway biprism will tile aperiodically in all dimensions of the form 3 times M.