ink

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. A pigmented liquid or paste used especially for writing or printing.
2. n. A dark liquid ejected for protection by most cephalopods, including the octopus and squid.
3. n. Informal Coverage in the print media; publicity: Her campaign rallies generated a lot of ink.
4. v. To mark, coat, or stain with ink.
5. v. Informal To append one's signature to (a contract, for example).

Century Dictionary and Cyclopedia

1. n. A colored fluid of slight viscosity used for writing or drawing, or a more viscous colored substance used in printing: distinguished as writing-ink and printing-ink. Common black writing-ink is generally made of an infusion of galls, copperas, and gum arabic. The coloring matter is the gallotannate of iron, which is suspended in water by gum arabic; a little logwood is generally added to deepen and improve the color. Sulphate of copper is also sometimes used in making writing-ink, but is rather injurious than otherwise. Printing-ink is a mechanical mixture of boiled oil and a black or colored pigment. For most inks linseed-oil is used, generally with some rosin; but rosin alone is used for the coarsest inks, and nut-oil or other fine oil for the finest. The pigment for black ink is lampblack or other carbonaceous matter. Soap is added to increase the facility of impression.
2. n. In zoology, the inky fluid of a cephalopod, as the cuttlefish.
3. n. A mixture of lampblack and turpentine used with a brush or stencil for marking packing-cases and other packages.
4. n. A writing-ink which cannot be changed by chemicals.
5. To color with ink.
6. To spread ink over; daub with ink.
7. n. In falconry, the neck, or that part from the head to the body of the bird that a hawk preys upon.
8. n. The socket of a mill-spindle.

Wiktionary

1. n. A pigment (or dye)-based fluid used for writing, printing etc.
2. n. countable A particular type, color or container of this fluid.
3. n. The black or dark-colored fluid ejected by squid, octopus etc, as a protective strategy.
4. n. slang, uncountable Publicity.
5. n. slang, uncountable Tattoo work.
6. n. slang Cheap red wine.
7. v. transitive To apply ink to; to cover or smear with ink.
8. v. transitive To sign (a document) (with or as if with ink).
9. v. transitive To apply a tattoo to (someone).

GNU Webster's 1913

1. n. (Mach.) The step, or socket, in which the lower end of a millstone spindle runs.
2. n. A fluid, or a viscous material or preparation of various kinds (commonly black or colored), used in writing or printing.
3. n. A pigment. See India ink, under India.
4. v. To put ink upon; to supply with ink; to blacken, color, or daub with ink.

WordNet 3.0

1. v. append one's signature to
2. n. dark protective fluid ejected into the water by cuttlefish and other cephalopods
3. v. fill with ink
4. n. a liquid used for printing or writing or drawing
5. v. mark, coat, cover, or stain with ink