Definition: The angle of incidence at the surface of a dielectric for which a wave polarized in the plane of incidence is not reflected at all, and an unpolarized wave is reflected as a plane-polarized one.
Other: This one almost didn’t make the cut, being so plebeian, but we’ve gotta throw a bone for all sorts of readers.
SNOOT score: I have no idea. In context, probably 1.
Source: Oxford English Dictionary