Is it ensure, insure, or assure?
chair on wheels intended for use by ladies and invalids. It was devised by James Heath, of Bath, Eng., about 1750. For the next three-quarters of a century it rivaled the sedan chair and ultimately superseded it as a form of conveyance in Great Britain. The most common variety was supported on two wheels joined by an axle beneath the seat, with a small pivoting wheel in front supporting the footrest.