walker in WordNet English dictionary

1. an enclosing framework on casters or wheels; helps babies learn to walk
   walker  baby-walker  go-cart 
   
2. a person who travels by foot
   pedestrian  walker  footer 
   
3. a light enclosing framework (trade name Zimmer) with rubber castors or wheels and handles; helps invalids or the handicapped or the aged to walk
   walker  Zimmer  Zimmer frame 
   
4. a shoe designed for comfortable walking
   walker