a fluid or viscous substance used for writing or printing.
a dark, protective fluid ejected by the cuttlefish and other cephalopods.
Informal. publicity, especially in print media: Their construction plans got some ink in the local paper.
verb (used with object)
to mark, stain, cover, or smear with ink: to ink one's clothes.
Slang. to sign one's name to (an official document): We expect to ink the contract tomorrow.

1200–50; Middle English inke, enke < Old French enque < Late Latin encautum, variant of encaustum < Greek énkauston purple ink, noun use of neuter of énkaustos burnt in. See encaustic

inker, noun
inkless, adjective
inklike, adjective
reink, verb (used with object)
uninked, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
ink (ɪŋk)
1.  a fluid or paste used for printing, writing, and drawing
2.  a dark brown fluid ejected into the water for self-concealment by an octopus or related mollusc from a gland (ink sac) near the anus
3.  to mark with ink
4.  to coat (a printing surface) with ink
[C13: from Old French enque, from Late Latin encaustum a purplish-red ink, from Greek enkauston purple ink, from enkaustos burnt in, from enkaiein to burn in; see en-², caustic]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

"the black liquor with which men write" [Johnson], mid-13c., from O.Fr. enque "dark writing fluid," from L.L. encaustum, from Gk. enkauston "purple or red ink," used by the Roman emperors to sign documents, originally a neut. adj. form of enkaustos "burned in," from stem of enkaiein "to burn in," from
en- "in" + kaiein "to burn" (see caustic). The word is from a Gk. method of applying colored wax and fixing it with heat. The verb meaning "to mark or stain in ink" is from 1560s. Inky "as black as ink" is attested from 1590s.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
ink   (ĭngk)  Pronunciation Key 
A dark liquid ejected for protection by most cephalopods, including the octopus and squid. Ink consists of highly concentrated melanin.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences for ink
The leaf was then dried and rubbed with ink, which would form a stain in the
Ancient books of the bataks were written in ink on paper made of bark.
Pen and ink and airbrush artists traditionally dominated this realm.
However as the ink was not tested, it was impossible to know when it was drawn.
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