airbrush

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun An atomizer using compressed air to spray a liquid, such as paint, on a surface.
• transitive verb To spray with an airbrush.
• transitive verb To alter (an image, especially a photograph) by means of an airbrush or other technique in order to increase its attractiveness or conceal an unwanted part.
• transitive verb To alter or obscure (an unwanted part) in an image, especially by using an airbrush.
• transitive verb To alter (a report, for example) in order to conceal or obscure unpleasant details.
• transitive verb To obscure or delete (unpleasant details) in a report or other document.

from The Century Dictionary.

• noun A peculiar kind of atomizer invented by Walkup, used by lithographers and artists for the distribution of color in minute quantities over a paper surface.

from the GNU version of the Collaborative International Dictionary of English.

• transitive verb to paint with an airbrush.
• transitive verb to alter or remove by use of an airbrush.
• A kind of atomizer for applying liquid coloring matter, such as paint, in a spray by compressed air.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A miniature, handheld paint sprayer, powered by compressed air or other gas, used for delicate, artistic painting, or sometimes retouching of photographs.
• verb To paint using an airbrush.
• verb To touch up or enhance a photograph, often with intent to mislead.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun an atomizer to spray paint by means of compressed air
• verb paint with an airbrush