Noun
MMCD (plural MMCDs)
Initialism of multimedia compact disc, a proposed storage medium eventually superseded by DVD.
In the early 1990s, two high-density optical storage standards were being developed: one was the MultiMedia Compact Disc (MMCD), backed by Philips and Sony, and the other was the Super Density disc (SD), supported by Toshiba and many others. Source: Internet
Philips and Sony abandoned their MMCD format and agreed upon Toshiba's SD format with only one modification. Source: Internet