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Loa (lō´ä), longest river of Chile, 275 mi (443 km) long, flowing S from the Andes, N Chile, then W and N through the Atacama Desert, before turning W to the Pacific Ocean. It is not navigable but affords some water supply and hydroelectric power for copper and nitrate-mining communities in its vicinity.

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Loa (loh-ă) n. a genus of parasitic nematode worms (see filaria). L. loa the eye worm, which lives within the tissues beneath the skin and causes loiasis.