BIPRISMS

Noun

biprisms

plural of biprism

Source: Wiktionary

BIPRISM

Bi"prism, n. [Pref. bi- + prism.]

1.

Definition: A prism whose refracting angle is very nearly 180 degrees.

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.

Source: Webster’s Unabridged Dictionary 1913 Edition

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