maclisp
     
        a dialect of lisp developed at mit ai lab in 1966, known
        for its efficiency and programming facilities.  later used by
        project mac, mathlab and macsyma.  ran on the pdp-10.
        introduced the lexpr a function with variable arity,
        macros, arrays, and catch/throw.  was once one of two
        main branches of lisp the other being interlisp.  in 1981
        common lisp was begun in an effort to combine the best
        features of both.
     
        "maclisp reference manual", d.a. moon
        , tr project mac, mit 1974.
     
     
see also:
lisp mit project mac mathlab macsyma pdp-10 
lexpr arity macro array catch/throw 
interlisp common lisp