Hypertext Webster Gateway: "handwheel"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Handwheel \Hand"wheel`\, n. (Mach.)
Any wheel worked by hand; esp., one the rim of which serves
as the handle by which a valve, car brake, or other part is
adjusted.
From WordNet (r) 1.7 (wn)
handwheel
n 1: a wheel worked by hand
2: control consisting of a wheel whose rim serves as the handle
by which a part is operated
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