Amici prism

[ uh-mee-chee ]
/ əˈmi tʃi /

noun Optics.

a compound prism that spreads out incident white light into a spectrum but produces no deviation of the central color of the dispersed beam.
Also called direct-vision prism, roof prism.

Origin of Amici prism

named after G. B. Amici (1784–1863), Italian astronomer