Definitions for "rxvt"
rxvt is a colour vt102 terminal emulator intended as an xterm replacement for users who do not require features such as Tektronix 4014 emulation and toolkit-style configurability. As a result, rxvt uses much less swap space.
Rxvt is an 8-bit clean, colour xterm replacement that uses significantly less memory than a conventional xterm, mostly since it doesn't support toolkit configurability or Tek graphics, but also since features can be removed at compile-time to reflect your needs.
Rxvt is a terminal emulator for the X Window System, originally written by Rob Nation and later extensively modified by Mark Olesen, who took over maintenance for several years. It is intended to be a slimmed-down replacement for xterm, omitting some of its little-used features, like Tektronix 4014 emulation. Rxvt is an extended version of the older xvt terminal emulator by John Bovey of the University of Kent at Canterbury.