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Any of various freshwater cyanobacteria of the genus Anabaena that sometimes occur in drinking water and cause a bad taste and odor.

[New Latin Anabaena, genus name, from Greek anabainein, to go up : ana-, ana- + bainein, to go; see gwā- in Indo-European roots.]


n, pl -nas
(Plants) any freshwater alga of the genus Anabaena, sometimes occurring in drinking water, giving it a fishy taste and smell
[New Latin, from Greek anabainein to shoot up, go up, from ana- + bainein to go; so called because they rise to the surface at intervals]