Noun
1. the color of the clear sky in the daytime;
"he had eyes of bright blue"2. blue clothing;
"she was wearing blue"3. any organization or party whose uniforms or badges are blue;
"the Union army was a vast blue"4. the sky as viewed during daylight;
"he shot an arrow into the blue"5. used to whiten laundry or hair or give it a bluish tinge
6. the sodium salt of amobarbital that is used as a barbiturate; used as a sedative and a hypnotic
7. any of numerous small chiefly blue butterflies of the family Lycaenidae
Adjective
1. 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. used to signify the Union forces in the Civil War (who wore blue uniforms);
"a ragged blue line"3. 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. characterized by profanity or cursing;
"foul-mouthed and blasphemous""blue language""profane words"5. 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. 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. morally rigorous and strict;
"blue laws""the puritan work ethic""puritanic distaste for alcohol""she was anything but puritanical in her behavior"8. 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"