Noun:
1: blueness, blue blue color or pigment; resembling the color of the clear sky in the daytime; "he had eyes of bright blue"
2: blue blue clothing; "she was wearing blue"
3: blue any organization or party whose uniforms or badges are blue; "the Union army was a vast blue"
4: blue air, blue, blue sky, wild blue yonder the sky as viewed during daylight; "he shot an arrow into the blue"
5: blue, blueing, bluing used to whiten laundry or hair or give it a bluish tinge
6: amobarbital sodium, blue angel, amytal, blue, blue devil the sodium salt of amobarbital that is used as a barbiturate; used as a sedative and a hypnotic
7: blue any of numerous small butterflies of the family Lycaenidae
Verb:
1: blue turn blue
Adjective:
1: blue, chromatic, bluish, blueish of the color intermediate between green and violet; having a color similar to that of a clear unclouded sky; "October's bright blue weather"- Helen Hunt Jackson; "a blue flame"; "blue haze of tobacco smoke"
2: blue, northern used to signify the Union forces in the American Civil War (who wore blue uniforms); "a ragged blue line"
3: dejected, low-spirited, downcast, downhearted, down in the mouth, low, depressed, dispirited, blue, down low in spirits; "lonely and blue in a strange city"; "depressed by the loss of his job"; "a dispirited and resigned expression on her face"; "downcast after his defeat"; "feeling discouraged and downhearted"
4: dirty, blue, profane, blasphemous characterized by profanity or cursing; "foul-mouthed and blasphemous"; "blue language"; "profane words"
5: juicy, sexy, gamey, spicy, racy, naughty, gamy, blue, risque suggestive of sexual impropriety; "a blue movie"; "blue jokes"; "he skips asterisks and gives you the gamy details"; "a juicy scandal"; "a naughty wink"; "naughty words"; "racy anecdotes"; "a risque story"; "spicy gossip"
6: aristocratic, gentle, noble, aristocratical, blue-blooded, patrician, blue belonging to or characteristic of the nobility or aristocracy; "an aristocratic family"; "aristocratic Bostonians"; "aristocratic government"; "a blue family"; "blue blood"; "the blue-blooded aristocracy"; "of gentle blood"; "patrician landholders of the American South"; "aristocratic bearing"; "aristocratic features"; "patrician tastes"
7: blue, puritanic, puritanical, puritan, strict, nonindulgent morally rigorous and strict; "blue laws"; "the puritan work ethic"; "puritanic distaste for alcohol"; "she was anything but puritanical in her behavior"
8: cheerless, disconsolate, dingy, sorry, blue, dispiriting, dismal, uncheerful, gloomy, drear, depressing, dreary, grim, dark, drab causing dejection; "a blue day"; "the dark days of the war"; "a week of rainy depressing weather"; "a disconsolate winter landscape"; "the first dismal dispiriting days of November"; "a dark gloomy day"; "grim rainy weather"