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A color between green and indigo on the spectrum. For individual blue dyes, see the specific name.
Synonym(s): cerulean


1. a color between green and indigo, produced by energy with wavelengths between 420 and 490 nm.
2. a dye or stain with this color.

aniline blue  a mixture of the trisulfonates of triphenyl rosaniline and of diphenyl rosaniline.
brilliant cresyl blue  an oxazin dye, usually C15H16N3OCl, used in staining blood.
methylene blue  dark green crystals or crystalline powder with a bronzelike luster; used in the treatment of methemoglobinemia and of cyanide poisoning, and as a bacteriologic stain and an indicator.
Prussian blue  an amorphous blue powder, Fe4[Fe(CN)6]3, used as a stain.
toluidine blue , toluidine blue O the chloride salt or zinc chloride double salt of aminodimethylaminotoluphenazthionium chloride; useful as a stain for demonstrating basophilic and metachromatic substances.
Drug slang A regional term for a depressant; crack
Fringe medicine A colour claimed in the pseudoscience of colour therapy to be antibacterial, maintain circulation in optimum condition, soothe nerves, increase vitality, treat rheumatic complaints, and prevent cancer
Physics A colour corresponding to wavelengths 455-492 nm


Physicians Desk Reference A book published annually that lists all ± 2500 US therapeutics requiring a physician prescription
PDR 7 color-coded sections
White Manufacturers' index, containing the company addresses and list of products
Pink Product name index, an alphabetical listing of the drugs by brand name
Blue Product classification, where drugs are subdivided into therapeutic classes
Yellow Generic and chemical name index
Multicolored Photographs of the most commonly prescribed tablets and capsules
White Product information, a reprint of the manufacturers' product inserts and
Green Diagnostic product information, a list of manufacturers of diagnostic tests used in office practice and the hospital; Cf Over-the-counter drugs  . ;.


A range of hues in the visible spectrum lying between green and indigo.
[M.E. fr. Germanic]


adj in Chinese medicine, a facial coloration, often on the nasal bridge, that indicates unresolved emotional shocks. Useful in diagnosis of childhood illnesses.


Visual sensation evoked by radiations within the waveband 450-490 nm. It is a primary colour and the complementary of yellow. See complementary colour; primary colours.


1. a color between green and violet in the visible spectrum; the color of the clear sky.
2. a silver-gray coat color. A description often used in dogs and cats, and some breeds of cattle.

Patient discussion about blue

Q. I’m sick of feeling blue, and wish I could just enjoy life like other people do. Hi, I get in to depressive episode even for minor issues. Although my depression makes it hard for me to maintain friendships, I have a number of close friends. I’m going well with my parents. I have a stable, well-paid job and a first class master’s degree. I'm fit, healthy and don't consider myself unattractive. I don't understand why I get depressed, but I feel down most of the time. I sleep too little or not enough, and my diet deteriorates during the real low periods. I lack motivation in everything and it started to affect my job. I’m sick of feeling blue, and wish I could just enjoy life like other people do.

A. Make an appointment with your doctor as soon as you can and tell him/her all that you are saying here. Your doctor can help you with this and get you going again. Don't put it off or try to cure yourself with alternative stuff.

Q. Is a Proventil Inhaler cheaper by you than Secirity Blue? I pay $60. with Security Blue now. Is it cheaper with you for a three months supply ?

A. here is a drug prices comparing site-

but i couldn't find there that other drug you were talking that it's name?

More discussions about blue
References in classic literature ?
He must have been already looking at Razumov, because that last saw the pale blue eyes fastened on him coldly.
The musician has announced details of Lots of Dots - the debut album from The Pale Blue Dots - a project borne out of his studies for an MA in Film Composition at a London film school.
But for the Scottish event the 23-year-old looked demure and delicate in a Dior pencil dress featuring a high waisted white pencil skirt and pale blue knotted silk top which showcased a teeny hint of toned tum.
Washington, July 31 ( ANI ): A new kind of hypercolour ice-cream has been invented, which changes hue from pale blue to deep purple to pink when it's licked.
Now it has brought the Aberdeenshire-based Pale Blue Dot Energy on board as coordinator, tasking the company with building a business case for the Teesside Industrial Carbon Capture Storage (CCS) project.
It's more of a bright blue blotch than a pale blue dot, but Earth still looks awfully insignificant in this July 19 photograph.
People with intense energy, with a bossy nature and natural driving force, are more likely to go for rich golds, reds, oranges and warm purples, while creative and energetic types, who love perfection and whose energy is contained, should favour white, tints of pale blue and green with occasional rich dark contrasts.
People with intense energy, with a bossy nature, are more likely to go for rich golds, reds, oranges and warm purples, while creative and energetic types, who love perfection and whose energy is contained, should favour white, tints of pale blue and green with rich dark contrasts.
com)-- Pale Blue Entertainment announces the release of “Never (Beverly Dr),” the new single and music video from the Sugar Burn Sessions album by singer-songwriter Tom Kurlander.
mischtschenkoana, which has pale blue flowers with a tiny deeper blue stripe down each petal.
In his novella Pale Blue Ink in a Lady's Hand, Franz Werfel masterfully draws out the contrast between the former imperial capital's urbane sophistication and the moral emptiness at its core.