blue color or pigment; resembling the color of the clear sky in the daytime

blue clothing

any organization or party whose uniforms or badges are blue

the sky as viewed during daylight

used to whiten laundry or hair or give it a bluish tinge

the sodium salt of amobarbital that is used as a barbiturate; used as a sedative and a hypnotic

any of numerous small butterflies of the family Lycaenidae