having the color of the clear sky, or a hue resembling it, whether lighter or darker; as, the deep, blue sea; as blue as a sapphire; blue violets.-pale, without redness or glare, -- said of a flame; hence, of the color of burning brimstone, betokening the presence of ghosts or devils; as, the candle burns blue; the air was blue with oaths.-low in spirits; melancholy; as, to feel blue.-suited to produce low spirits; gloomy in prospect; as, thongs looked blue.-severe or over strict in morals; gloom; as, blue and sour religionists; suiting one who is over strict in morals; inculcating an impracticable, severe, or gloomy mortality; as, blue laws.-literary; -- applied to women; -- an abbreviation of bluestocking.-one of the seven colors into which the rays of light divide themselves, when refracted through a glass prism; the color of the clear sky, or a color resembling that, whether lighter or darker; a pigment having such color. sometimes, poetically, the sky.-a pedantic woman; a bluestocking.-low spirits; a fit of despondency; melancholy.-to make blue; to dye of a blue color; to make blue by heating, as metals, etc.