1
: the activity of riding in a motorboat for leisure
The former was fronted by a vocal quartet that … featured an ironic-considering-the-weather song, "Pontoon," an ode to summer motorboating.—
John Serba, The Grand Rapids (Michigan) Press, 10 Jan. 2014
2
: an inherent low frequency instability in electronic circuits characterized when heard on a telephone receiver or loudspeaker by a noise similar to the exhaust of a motorboat
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Merriam-Webster unabridged
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