| 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 |
| clue | (noun) a slight indication | Synonyms: hint |
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| (noun) evidence that helps to solve a problem | Synonyms: clew, cue |
| eigenvalue | (noun) (mathematics) any number such that a given square matrix minus that number times the identity matrix has a zero determinant | Synonyms: characteristic root of a square matrix, eigenvalue of a matrix, eigenvalue of a square matrix |
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| flue | (noun) a conduit to carry off smoke | - |
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| (noun) organ pipe whose tone is produced by air passing across the sharp edge of a fissure or lip | Synonyms: flue pipe, labial pipe |
| (noun) flat bladelike projection on the arm of an anchor | Synonyms: fluke |
| glue | (noun) cement consisting of a sticky substance that is used as an adhesive | Synonyms: gum, mucilage |
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| value | (noun) the quality (positive or negative) that renders something desirable or valuable | - |
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| (noun) relative darkness or lightness of a color | - |
| (noun) a numerical quantity measured or assigned or computed | - |
| (noun) an ideal accepted by some individual or group | - |
| (noun) the amount (of money or goods or services) that is considered to be a fair equivalent for something else | Synonyms: economic value |
| (noun) (music) the relative duration of a musical note | Synonyms: note value, time value |