<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def _member_def(self, member):
 """ Return an individual member definition formatted as an RST glossary entry, wrapped to fit within 78 columns. """

        member_docstring = textwrap.dedent(member.docstring).strip()
        member_docstring = textwrap.fill(
            member_docstring, width=78, initial_indent=' '*4,
            subsequent_indent=' '*4
        )
        return '%s\n%s\n' % (member.name, member_docstring)