m-expression lisp

from The Free On-line Dictionary of Computing (8 July 2008)

M-expression LISP

   (MLISP) The original "{meta-language}" {syntax} of {Lisp},
   designed by {John McCarthy} in 1962.  MLISP was intended for
   external use in place of the parenthesised {S-expression}
   {syntax}.

   ["LISP 1.5 Programmer's Manual", J. McCarthy et al, MIT Press
   1962].

   (1994-11-22)