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5 definitions found
 for DDT
From WordNet (r) 3.0 (2006) :

  DDT
      n 1: an insecticide that is also toxic to animals and humans;
           banned in the United States since 1972 [syn:
           dichlorodiphenyltrichloroethane, DDT]

From Moby Thesaurus II by Grady Ward, 1.0 :

  25 Moby Thesaurus words for "DDT":
     DDD, Paris green, antimony, arsenic, arsenic trioxide, beryllium,
     bichloride of mercury, cadmium, carbolic acid, carbon monoxide,
     carbon tetrachloride, chlorine, cyanide, hydrocyanic acid,
     hyoscyamine, lead, mercuric chloride, mercury, mustard gas,
     nicotine, phenol, poison gas, prussic acid, selenium, strychnine
  
  

From V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016) :

  DDT
         Dynamic Debugging Tool (DEC, CP/M)
         

From The Jargon File (version 4.4.7, 29 Dec 2003) :

  DDT
   /D?D?T/, n.
  
      [from the insecticide para-dichloro-diphenyl-trichloroethene]
  
      1. Generic term for a program that assists in debugging other programs by
      showing individual machine instructions in a readable symbolic form and
      letting the user change them. In this sense the term DDT is now archaic,
      having been widely displaced by debugger or names of individual programs
      like adb, sdb, dbx, or gdb.
  
      2. [ITS] Under MIT's fabled ITS operating system, DDT (running under the
      alias HACTRN, a six-letterism for ?Hack Translator?) was also used as the {
      shell or top level command language used to execute other programs.
  
      3. Any one of several specific DDTs (sense 1) supported on early DEC
      hardware and CP/M. The PDP-10 Reference Handbook (1969) contained a
      footnote on the first page of the documentation for DDT that illuminates
      the origin of the term:
  
          Historical footnote: DDT was developed at MIT for the PDP-1 computer in
          1961. At that time DDT stood for ?DEC Debugging Tape?. Since then, the
          idea of an on-line debugging program has propagated throughout the
          computer industry. DDT programs are now available for all DEC
          computers. Since media other than tape are now frequently used, the
          more descriptive name ?Dynamic Debugging Technique? has been adopted,
          retaining the DDT abbreviation. Confusion between DDT-10 and another
          well known pesticide, dichloro-diphenyl-trichloroethane C[14]H[9]Cl[5]
          should be minimal since each attacks a different, and apparently
          mutually exclusive, class of bugs.
  
      (The ?tape? referred to was, incidentally, not magnetic but paper.) Sadly,
      this quotation was removed from later editions of the handbook after the {
      suits took over and DEC became much more ?businesslike?.
  
      The history above is known to many old-time hackers. But there's more:
      Peter Samson, compiler of the original TMRC lexicon, reports that he
      named DDT after a similar tool on the TX-0 computer, the direct ancestor of
      the PDP-1 built at MIT's Lincoln Lab in 1957. The debugger on that
      ground-breaking machine rejoiced in the name FLIT (FLexowriter
      Interrogation Tape). Flit was for many years the trade-name of a popular
      insecticide.
  

From The Free On-line Dictionary of Computing (30 December 2018) :

  DDT
  
     1. Generic term for a program that assists in debugging other
     programs by showing individual machine instructions in a
     readable symbolic form and letting the user change them.  In
     this sense the term DDT is now archaic, having been widely
     displaced by "debugger" or names of individual programs like
     "{adb", "{sdb}", "{dbx}", or "{gdb}".
  
     2. Under MIT's fabled ITS operating system, DDT (running
     under the alias HACTRN) was also used as the shell or top
     level command language used to execute other programs.
  
     3. Any one of several specific debuggers supported on early
     DEC hardware.  The DEC PDP-10 Reference Handbook (1969)
     contained a footnote on the first page of the documentation
     for DDT that illuminates the origin of the term:
  
     Historical footnote: DDT was developed at MIT for the
     PDP-1 computer in 1961.  At that time DDT stood for "DEC
     Debugging Tape".  Since then, the idea of an on-line debugging
     program has propagated throughout the computer industry.  DDT
     programs are now available for all DEC computers.  Since media
     other than tape are now frequently used, the more descriptive
     name "Dynamic Debugging Technique" has been adopted, retaining
     the DDT abbreviation.  Confusion between DDT-10 and another
     well known pesticide, dichloro-diphenyl-trichloroethane
     (C14-H9-Cl5) should be minimal since each attacks a different,
     and apparently mutually exclusive, class of bugs.
  
     (The "tape" referred to was, incidentally, not magnetic but
     paper.)  Sadly, this quotation was removed from later editions
     of the handbook after the suits took over and DEC became
     much more "businesslike".
  
     The history above is known to many old-time hackers.  But
     there's more: Peter Samson, compiler of the original TMRC
     lexicon, reports that he named "DDT" after a similar tool on
     the TX-0 computer, the direct ancestor of the PDP-1 built at
     MIT's Lincoln Lab in 1957.  The debugger on that
     ground-breaking machine (the first transistorised computer)
     rejoiced in the name FLIT (FLexowriter Interrogation Tape).
  
     [{Jargon File]
  

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