Source : Free On-Line Dictionary of Computing

Synchronous Dynamic Random Access Memory
     
         (SDRAM, Synchronous DRAM) A form of {DRAM} which
        adds a separate {clock} signal to the control signals.  SDRAM
        chips can contain more complex {state machines}, allowing them
        to support "burst" access modes that clock out a series of
        successive {bits} (similar to the {nibble mode DRAM}).
     
        (1996-10-05)