Source : Free On-Line Dictionary of Computing

LRLTRAN
     
        Lawrence Radiation Laboratory TRANslator.
     
        A {Fortran} extension with vector arithmetic and {dynamic
        storage}, used for scientific work and systems programming,
        including the {LTSS} {operating system}.
     
        ["The LRLTRAN Compiler", S.F. Mendicino, CACM 11(11):747-775
        (Nov 1969)].