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A wave that oscillates in lakes, bays, or gulfs from a few minutes to a few hours as a result of seismic or atmospheric disturbances.
[French dialectal, exposed lake bottom, probably from French sèche, feminine of sec, dry; see sec1.]
(Physical Geography) a periodic oscillation of the surface of an enclosed or semi-enclosed body of water (lake, inland sea, bay, etc) caused by such phenomena as atmospheric pressure changes, winds, tidal currents, and earthquakes
[C19: from Swiss French, first used to describe the rise and fall of water in Lake Geneva; of obscure origin]
a random oscillation of the water of a lake, bay, etc., caused by wind or earthquake.
[1830–40; < Franco-Provençal]