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

  file descriptor
      An integer that identifies an
     open file within a process.  This number is obtained as a
     result of opening a file.  Operations which read, write, or
     close a file would take the file descriptor as an input
     In many operating system implementations, file descriptors
     are small integers which index a table of open files.  In
     Unix, file descriptors 0, 1 and 2 correspond to the
     standard input, standard output and standard error files
     See file descriptor leak.

Contact=webmaster@dict.org Specification=RFC 2229