Arctic loon
(physics) The ratio of the RMS value to the absolute mean of a sinusoidal wave (especially to that of an alternating current)
Any diatom of the family Plagiogrammaceae
(Canada, US) The black-throated diver bird.
Somewhat or partly carbonaceous.
夜明け、鏡のように静まった湖面をハシグロアビが静かに滑るように泳ぎ、その黒い喉が淡い光に照らされていた。
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