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 sky, blue, wild blue yonder, blue air the sky as viewed during daylight; "he shot an arrow into the blue"
5: bluing, blueing, blue used to whiten laundry or hair or give it a bluish tinge
6: blue angel, amobarbital sodium, blue, blue devil, amytal 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: blueish, bluish, blue, chromatic 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: down in the mouth, low-spirited, downcast, dispirited, down, depressed, low, dejected, downhearted, blue 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, profane, blasphemous, blue characterized by profanity or cursing; "foul-mouthed and blasphemous"; "blue language"; "profane words"
5: juicy, racy, gamy, gamey, naughty, sexy, blue, risque, spicy 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: blue-blooded, aristocratic, gentle, patrician, aristocratical, noble, 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: puritanic, nonindulgent, blue, puritanical, puritan, strict morally rigorous and strict; "blue laws"; "the puritan work ethic"; "puritanic distaste for alcohol"; "she was anything but puritanical in her behavior"
8: gloomy, depressing, dispiriting, uncheerful, dreary, dark, drab, dingy, blue, drear, dismal, grim, disconsolate, cheerless, sorry 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"