Source : Free On-Line Dictionary of Computing

bit slice
     
         A technique for constructing a {processor} from
        modules, each of which processes one {bit-field} or "slice" of
        an {operand}.  Bit slice processors usually consist of an
        {ALU} of 1, 2, 4 or 8 bits and control lines (including
        {carry} or {overflow} signals usually internal to the {CPU}).
        For example, two 4-bit ALUs could be arranged side by side,
        with control lines between them, to form an 8-bit ALU.  A
        {sequencer} executes a program to provide data and control
        signals.
     
        The {AMD Am2901} is an example.
     
        (1994-11-15)