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red tide

n :  seawater discolored by the presence of large numbers of dinoflagellates esp. of the genera Gonyaulax and Gymnodinium which produce a toxin poisonous esp. to many forms of marine vertebrate life and to humans who consume contaminated shellfish - see PARALYTIC SHELLFISH POISONING  - compare SAXITOXIN  .
Similar sounding terms:  ra·dio·io·dide 

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Twin Lakes Regional Medical Center (Leitchfield, Kentucky - Grayson County)