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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