direct-vision prism

[ dih-rekt-vizh-uh n, dahy- ]
/ dɪˈrɛktˈvɪʒ ən, daɪ- /

noun Optics.

Origin of direct-vision prism

probably earlier than 1960–65
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019