a Mexican plant, Agave tequilana variant weber, with blue leaves, used in tequila.
the pure color of a clear sky; the primary color between green and violet in the visible spectrum, an effect of light with a wavelength between 450 and 500 nm. bluing. something having a blue color: Place the blue next to the red. a person who wears blue or is a member of a group […]
(in military or civilian defense) an alert following the first, or yellow, alert, in which air attack seems probable.
blue and the gray
blue heaven. a blue capsule or tablet containing the barbiturate amobarbital or its derivative.