Bible Dictionaries
Biprism
Webster's Dictionary
(1):
(n.) 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.
(2):
(n.) A prism whose refracting angle is very nearly 180 degrees.
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Bibliography Information
Webster, Noah. Entry for 'Biprism'. Noah Webster's American Dictionary. https://www.studylight.org/dictionaries/eng/web/b/biprism.html. 1828.