noun: A design feature copied from a similar artifact in another material, even when not functionally necessary. For example, the click sound of a shutter in an analog camera that is now reproduced in a digital camera by playing a sound clip.
From Greek skeuos (vessel, implement) + -morph (form).
A skeuomorph can be employed for various purposes. Since people are used to the click sound of a camera as feedback that the picture has been taken, it is now artificially-produced in digital cameras. Other examples are copper cladding on a zinc penny (for familiarity) and wood finish on a plastic product (for a more expensive look).
“While working two months ago in South Lowestoft, Suffolk, British archaeologist Clare Good excavated a four-sided object made of the mineral jet. It closely matches a geometrically designed gold object found far away at a burial site called Bush Barrow near Stonehenge in Wiltshire. The match is so close that experts believe the black artifact is a skeuomorph, or a copy in a different material.”
Jennifer Viegas; Stonehenge Amulets Worn by Elite; Discovery News; Apr 6, 2007.