Dye is a substance that's used to change the color of whatever it's applied to. You can use hair dye to change your light brown hair to deep, dark purple.

Dye is used on fabrics, hair, yarn and other fibers, clothing, and food, among other things. When you apply dye to something, you dye it. If you're baking a birthday cake for your friend who loves the color orange, you might use food coloring — a type of dye — to dye the vanilla frosting orange. The Old English root of dye is deah, "a color or hue," which is possibly related to deagol, "secret, hidden, or dark."

Definitions of dye
  1. noun
    a usually soluble substance for staining or coloring e.g. fabrics or hair
    synonyms: dyestuff
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    acid dye
    dye in which the chromophore is part of a negative ion
    alizarin yellow
    any of various yellow dyes; not related chemically to alizarin but applied in the same manner
    anil, indigo, indigotin
    a blue dye obtained from plants or made synthetically
    aniline dye
    any of many dyes made from aniline
    azo dye
    any dye containing one or more azo groups
    basic color, basic colour, basic dye
    a dye that is considered to be a base because the chromophore is part of a positive ion
    blue, blueing, bluing
    used to whiten laundry or hair or give it a bluish tinge
    bromophenol blue, bromphenol blue, tetrabromo-phenolsulfonephthalein
    a dye used as an acid-base indicator
    bromothymol blue, bromthymol blue
    a dye used as an acid-base indicator
    a red dyestuff consisting of dried bodies of female cochineal insects
    cyanine dye
    any of a class of dyes containing a -CH= group linking two heterocyclic rings containing nitrogen; used as sensitizers in photography
    direct dye, substantive dye
    dye with a high affinity for cellulose fibers (cotton or rayon etc.)
    fluorescein, fluoresceine, fluorescent dye, resorcinolphthalein
    a yellow dye that is visible even when highly diluted; used as an absorption indicator when silver nitrate solution is added to sodium chloride in order to precipitate silver chloride (turns pink when no chloride ions are left in solution and negative fluorescein ions are then absorbed)
    any of various fluorescent substances used in fluorescence microscopy to stain specimens
    hair coloring, hair dye
    a dye or tint for the hair
    Kendal, Kendal green
    a green dye, often used to color cloth, which is obtained from the woad plant
    lac dye
    scarlet dye like cochineal; extracted with alkali from stick lac
    lead acetate, sugar of lead
    a poisonous white solid (Pb[CH3CO]2) used in dyeing cotton and in making enamels and varnishes
    archil, cudbear, orchil
    a purplish dye obtained from orchil lichens
    a yellow dye made from the bark of the quercitron oak tree
    radiopaque dye
    dye that does not allow the passage of X rays or other radiation; used to outline certain organs during X-ray examination
    saffranine, safranin, safranine
    any of a class of chiefly red organic dyes
    Tyrian purple
    a red-purple to deep purple dye obtained from snails or made synthetically
    vat color, vat dye
    a water-insoluble dye that is applied by reducing the dye to an alkaline form, applying the dye, then regenerating the insoluble dye by oxidation in the material; used for dyeing cotton
    a blue dyestuff obtained from the woad plant
    metallized dye
    acid dye in which the negative ion contains a chelated metal atom
    congo red
    a red-brown azo dye especially as a chemical pH indicator (congo red is red in basic and blue in acidic solutions)
    methyl orange
    an azo dye used as an acid-base indicator; used for titrations involving weak bases
    bromeosin, eosin
    a red fluorescent dye resulting from the action of bromine on fluorescein; used in cosmetics and as a biological stain for studying cell structures
    fluorescein isocyanate, fluorescein isothiocyanate
    a fluorochrome commonly conjugated with antibodies for use in indirect immunofluorescence
    a reddish brown dye used especially on hair
    a liquid preparation used on wet hair to give it a tint
    a purplish red water-soluble dye used in microscopy
    type of:
    color, coloring material, colour, colouring material
    any material used for its color
  2. verb
    color with dye
    “Please dye these shoes”
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    give the color and appearance of bronze to something
    color for microscopic study
    dye thoroughly
    impress, yarn-dye
    dye (fabric) before it is spun
    color with a liquid dye or tint
    fast dye
    dye with fast colors
    double dye
    dye twice
    dye by hand
    dye after weaving
    ebonise, ebonize
    stain black to make it look like ebony
    stain an object by immersing it in a liquid
    dye after knotting the fabric to produce an irregular pattern
    dye with wax
    stain (skin) with indelible color
    paint or stain like marble
    make a veinlike pattern
    type of:
    color, colour, discolor, discolour
    change color, often in an undesired manner
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