Pronunciation: (rō'but, -bot), [key]
1. a machine that resembles a human and does mechanical, routine tasks on command.
2. a person who acts and responds in a mechanical, routine manner, usually subject to another's will; automaton.
3. any machine or mechanical device that operates automatically with humanlike skill.
operating automatically: a robot train operating between airline terminals.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.