Webster's English Dictionary

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blue

1. blue or blue.ish \'blu:\ \-ish\ aj [ME, fr. OF blou, of Gmc origin; akin 
   to OHG bla-o blue; akin to] L flavus yellow, OE b-l fire - more at 
   BALD 1: of the color blue  2a: BLUISH  2b: LIVID {~ with cold}  2c: bluish 
   gray {~ cat}  3a: low in spirits : MELANCHOLY  3b: productive of low 
   spirits : DEPRESSING {things looked ~R} 4: wearing blue  of a woman  5: 
   LEARNED, INTELLECTUAL  6: PURITANICAL  7: PROFANE, INDECENT  - blue.ly av
2. blue n 1: a color whose hue is that of the clear sky or that of the 
   portion of the  color spectrum lying between green and violet 2a: a pigment 
   or dye that colors blue  2b: BLUING  3a: blue clothing or cloth  3b: one 
   belonging to an organization whose uniform or badge is blue  4a1: SKY  4a2: 
   the far distance  4b: SEA  5: a blue object  6: BLUESTOCKING 
3. blue vb or blued;  or blue.ing;  or blu.ing : to make blue  : to turn 
   blue