rollator
n.— «His sister-in-law commented that older people in Sweden sustain their stamina by walking behind a so-called rollator. Unlike a conventional “clomp and stomp” walker, a rollator glides over pavement, carpet, thresholds and grass on large rubber wheels—much like a shopping cart with brakes, but without a big basket.» —“A New Rolling Walker To Get the Frail Moving Lacks Market Traction” by Thomas Petzinger Jr. in Pittsburgh, Pa. Wall Street Journal (B1) Oct. 2, 1998. (source: Double-Tongued Dictionary)
Further reading
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