[red tide] n (1904): 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--compare saxitoxin
RED TIDE
Meaning of RED TIDE in English
Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012