"Irrefrangible" is a word in ENGLISH

The convergence to different foci, by a lens or mirror, of rays of light emanating from one and the same …

The conversion of obscure radiant heat into light; the transmutation of rays of heat into others of higher refrangibility.

The separation of light into its different colored rays, arising from their different refrangibilities.

That property which some transparent bodies have of producing at their surface, or within their substance, light different in color …

A body, usually spheroidal, in a cell or a protozoan, distinguished from the surrounding protoplasm by a difference in refrangibility …

The quality of being refrangible.

Capable of being refracted, or turned out of a direct course, in passing from one medium to another, as rays …

The property possessed by heat of being composed, like light, of rays of different degrees of refrangibility, which are unequal …

Situated beyond or below the red rays; as, the ultrated rays of the spectrum, which are less refrangible than the …

Lying outside the visible spectrum at its violet end; -- said of rays more refrangible than the extreme violet rays …

The color of a violet, or that part of the spectrum farthest from red. It is the most refrangible part …