Online Encyclopedia Search Tool

Your Online Encyclopedia


Online Encylopedia and Dictionary Research Site

Online Encyclopedia Free Search Online Encyclopedia Search    Online Encyclopedia Browse    welcome to our free dictionary for your research of every kind

Online Encyclopedia


The word radius (Latin for "wheel spoke"; plural radii, pronounced ray-dee-eye) has several meanings in English:

  • In classical geometry, a radius of a circle or sphere is any line segment with one endpoint on the circle (i.e., the circular boundary) and the other at the center of the circle. By extension, the radius of a circle or sphere is the length of any such segment.
  • RADIUS is a remote access and dial-in protocol.
  • Radius Fidonet mailer is an Argus successor.

Last updated: 02-05-2005 11:10:06
Last updated: 03-18-2005 11:16:12