YouTheDesigner.com has a great article which shares graphic design terms.
Here are some of my favorites:
Ear The rounded part of the lowercase letters such as ‘g’ and ‘q’.
Feathering A tool used in graphic design software that makes the edges of an image appear softer.
Hue One of the three primary attributes of color. A hue is a variety of color, such as, red, blue green or yellow.
Kerning Modifying the horizontal space between letters.
Layers A tool within graphic software that permits the user to gather, organize and re-edit their artwork.
Page Layout Deals with the setup and style of content on a page. An example of a page layout is the pages in magazines or brochures.
Sans Serif A style of typeface that means "without feet." Usual sans serif typefaces include Arial, Helvetica, AvantGarde and Verdana.
Vector Graphic Vector graphics allows the designer to expand or reduce the vector graphic in size without any loss in quality using curves, points, lines and polygons.
WYSIWYG What You See Is What You Get. This is an approximate screen representation of what the final printed image will look like.