plummet(redirected from plummeting)
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a lead plumb used by anglers to determine the depth of water
A loose-fitting metal plug in a tapered rotameter tube which moves upward (or downward) with an increase (or decrease) in fluid flow rate upward through the tube. Also known as float.
plumb bob, plummet
A shaped metal weight which is suspended from the lower end of a line to determine the vertical. (See illustration p. 744.)