/waw"keuhr/ , n.
1. an enclosing framework on casters or wheels for supporting a baby who is learning to walk.
2. a similar device, usually a waist-high four-legged framework of lightweight metal, for use by a weak or disabled person as a support while walking.
3. ( usually cap. ) Informal. See Walker hound .
4. a person or thing that walks or likes to walk: He's a great walker.
5. Theater Slang. an extra or supernumerary.
6. Slang. a musician required by a union contract to be hired and paid full salary even when not needed for performance.
[ 1325-75; ME; see WALK, -ER 1 ]