| Blue | any of numerous small chiefly blue butterflies of the family Lycaenidae |
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| Blue | the sodium salt of amobarbital that is used as a barbiturate |
| Blue | blue clothing |
| Blue | the color of the clear sky in the daytime |
| Blue | any organization or party whose uniforms or badges are blue |
| Blue | the sky as viewed during daylight |
| Blue | used to whiten laundry or hair or give it a bluish tinge |
| Blue | turn blue |
| Blue | causing dejection |
| Blue | having a color similar to that of a clear unclouded sky |
| Blue | characterized by or marked with a bluish color |
| Blue | tinged with blue or purple from cold or contusion |