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Definition: die

An unpackaged, bare chip. A die is the formal term for the square of silicon containing an integrated circuit that has been cut out of the wafer. Die is singular, and dice is plural. See MCM, wafer and chip.

Dice on a Wafer
This picture of several dice on the wafer shows the various subsystems on each die (chip). This image is called a "beauty shot," because the different areas are colored for presentation. (Image courtesy of Texas Instruments, Inc.)