third rail Hear it!

third rail definition

☆ third rail

an extra rail used in some electric railways, instead of an overhead wire, for supplying power

Webster's New World College Dictionary Copyright © 2005 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

Comments
Improve this definition.
Do you have more to add? Share your linguistic knowledge or observation.
/Register to save your comments.