:admin: /ad-min'/ /n./ Short for `administrator'; very
commonly used in speech or on-line to refer to the systems person
in charge on a computer. Common constructions on this include
`sysadmin' and `site admin' (emphasizing the administrator's
role as a site contact for email and news) or `newsadmin'
(focusing specifically on news). Compare {postmaster},
{sysop}, {system mangler}.
--- The Hacker's Dictionary
Version 3.3.2, 20 March 1996