The Collaborative International Dictionary of English v.0.48:

ink-jet printer \ink"-jet` printer\, n. (Computers)
   A type of printer used as a peripheral device for computers,
   in which the color is applied to the paper by spraying liquid
   ink onto paper through tiny orifices in a moving print head,
   to construct the desired pattern on the paper by placing one
   dot or several dots at a time on the paper.
   [PJC]

WordNet (r) 3.0 (2006):

ink-jet printer
    n 1: a printer that produces characters by projecting
         electrically charged droplets of ink