(of rules, standards, etc.) unambiguously clear:
This muddies the waters of what should be a brightline rule.
Physical Chemistry, brightline spectrum.
the spectrum of an incandescent substance appearing on a spectrogram as one or more bright lines against a dark background.
the wool of sheep raised east of the Mississippi River.
polished metal parts, as on a ship or automobile. Nautical. all plain or varnished woodwork that is kept scoured on a vessel. noun shiny metal trimmings or fittings on ships, cars, etc varnished or plain woodwork on a vessel
noun (vet science) blindness occurring in sheep grazing pastures heavily infested with bracken