deliminator
/de.lim'.in.ay.t@r/, n.
[portmanteau, delimiter + eliminate] A string or pattern used to
delimit text into fields, but which is itself eliminated from the
resulting list of fields. This jargon seems to have originated among
Perl hackers in connection with the Perl split() function; however, it
has been sighted in live use among Java and even Visual Basic
programmers.