Wheelchair

n. chair with wheels used by the handicapped for transportation

A wheelchair is a wheeled mobility device in which the user sits. The device is propelled either manually (by pushing the wheels with the hands) or via various automated systems. Wheelchairs are used by people for whom walking is difficult or impossible due to illness, injury, or disability. People with both sitting and walking disability often need to use a wheelbench. The earliest record of the wheelchair in England dates from the 1670s [Oxford English Dictionary, (2nd Ed.), 1989, Vol. XX., p. 203.], and in continental Europe this technology dates back to the German Renaissance.
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Wheel·chair or wheel chair n. A chair mounted on large wheels for the use of a sick or disabled person. [more]Wheelchair - Community and Resources

Noun
1. a movable chair mounted on large wheels; for invalids or those who cannot walk; frequently propelled by the occupant
(hypernym) chair
(hyponym) bath chair

A mobility aid belonging to any class of three or four wheeled devices, usable indoors, designed for and used by individuals with mobility impairments, whether operated manually or powered. A "common wheelchair" is such a device which does not exceed 30 inches in width and 48 inches in length measured two inches above the ground, and does not weigh more than 600 pounds when occupied. (49CFR37)