a brownish-red discoloration of marine waters caused by the presence of enormous numbers of certain microscopic flagellates, especially the dinoflagellates, that often produce a potent neurotoxin that accumulates in the tissues of shellfish, making them poisonous when eaten by humans and other vertebrates.
a discoloration of sea water caused by an explosive growth in phytoplankton density: sometimes toxic to fish life and, through accumulation in shellfish, to humans
A population explosion of certain species of dinoflagellates, a kind of protozoan found in plankton. The dinoflagellates color the water red or reddish-brown and secrete a toxin that kills fish. Red tide usually occurs in warm coastal waters.
noun 1. any of several grasses of the genus Agrostis having reddish panicles, as A. gigantea, widely cultivated for lawns and pasturage.
noun 1. a tabloid newspaper characterized by sensationalism
- Red tory
noun 1. (Canadian) a Conservative who holds liberal or mildy socialist views on certain fiscal and social issues
noun 1. a hardy plant, Trillium sessile, common from New York to Georgia and westward, having stalkless, purple or green flowers.