Abbreviation for High Definition Compatible Disc. This is a new format for high-resolution audio on regular five-inch (CD) style discs. Basically they are just like a regular CD, except they have 20-bit (as opposed to the traditional 16-bit) audio recorded on them. While discs made to this standard are (thankfully) compatible with existing 16-bit CD players, it takes a special HDCD player to reproduce the full 20-bit audio.
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