Sentence:  In a laboratory in California, a machine which walk across any surface, however uneven, is undergoing final tests. Known as a <WSD>pedipulator</WSD>, it can carry a 26-pound pack of delicate instruments on its back at a speed of five miles an hour. 
Meaning of the word marked with <WSD> tags:  A component mechanism which gives a robot the capability of walking; a robot having such a capability.