means A chair mounted on wheels that lets a person who can't walk, or walks with difficulty, move around under their own or another's power.

from A plain English compound of "wheel" and "chair," both ancient words doing exactly what they say — "wheel" from Old English "hweol," a cousin of words across the Indo-European family all circling back to a sense of turning, and "chair" arriving via Old French "chaiere" from Latin "cathedra," a seat. The joined word is recorded from the 17th century, when wheeled invalid chairs began appearing; the famously stylish "Bath chair," named for the spa town where the ailing were trundled to take the waters, came later.