Definition of "Walker" :

noun: an enclosing framework on casters or wheels; helps babies learn to walk

noun: a light enclosing framework (trade name Zimmer) with rubber castors or wheels and handles; helps invalids or the handicapped or the aged to walk

noun: a shoe designed for comfortable walking

noun: a person who travels by foot

noun: United States writer (born in 1944)

noun: New Zealand runner who in 1975 became the first person to run a mile in less that 3 minutes and 50 seconds (born in 1952)