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direct-vision prism

[dih-rekt-vizh-uh n, dahy-] /dɪˈrɛktˈvɪʒ ən, daɪ-/
noun, Optics.
Origin
1960-1965
probably earlier than 1960-65
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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