Definition of: ink

(ingk) noun
1. A colored liquid or viscous substance, used in writing, printing, etc. ♦ Collateral adjective: atramental.
2. The dark fluid secreted by a cuttlefish and ejected so as to color the water and thus assist in escaping an enemy.
—v.t. To spread ink upon; mark or color with ink. [<OF enque <LL encaustum purple ink used by the Caesars <Gk. enkauston, neut. of enkaustos burned out. See ENCAUSTIC.]
—ink′er noun