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Definition of Rotameter
1. [n -S]
Medical Definition of Rotameter
1. A device for measuring the flow of gas or liquid; the fluid flowing up through a slightly tapered tube elevates a ball or other weight that partially obstructs the flow, until the wider cross-section allows that flow to pass around the floating obstruction. Origin: L. Rota, wheel, + G. Metron, measure (05 Mar 2000)