| blue | (noun) any of numerous small butterflies of the family Lycaenidae | - |
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| (noun) the sodium salt of amobarbital that is used as a barbiturate; used as a sedative and a hypnotic | Synonyms: amobarbital sodium, Amytal, blue angel, blue devil |
| (noun) blue clothing | - |
| (noun) blue color or pigment; resembling the color of the clear sky in the daytime | Synonyms: blueness |
| (noun) any organization or party whose uniforms or badges are blue | - |
| (noun) the sky as viewed during daylight | Synonyms: blue air, blue sky, wild blue yonder |
| (noun) used to whiten laundry or hair or give it a bluish tinge | Synonyms: blueing, bluing |