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plural only
(computer graphics, informal) Jagged artifacts in raster graphics, such as those caused by resizing a bitmap image without preserving its aspect ratio. quotations examples
The anti-alias option in image editors helps to eliminate the jaggies.
1999, Brent Heslop, David Angell, Rick Darnell, Microsoft Word 2000 Bible
Edge antialiasing only works at the edges of primitives, but jaggies can happen also at intersections of polygons.
2007, Pulli et al, Mobile 3D Graphics: With OpenGL ES and M3G