|backbone site - A key Usenet, electronic mail and/or Internet site; one
that processes a large amount of third-party traffic,
especially if it is the home site of any of the regional
coordinators for the Usenet maps. Notable backbone sites as
of early 1993 include uunet and the mail machines at
Rutgers University, UC Berkeley, DEC's Western Research
Laboratories, Ohio State University and the University of Texas.|
Compare rib site, leaf site.