Oscillating water column

From International Dictionary of Marine Aids to Navigation
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Acronym: OWC

A form of wave-actuated generator that can be used on buoys, consisting of an inverted tube open to the sea at its base, within which the water column can oscillate and act as a piston forcing air through overhead valves into a low-pressure air turbine.

Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)

International Association of Marine Aids to Navigation and Lighthouse Authorities - AISM