noun Date: 1864 any of various algae (especially spirogyra) or cyanobacteria, a mass of tangled filaments of algae or cyanobacteria in stagnant waters
POND SCUM
Meaning of POND SCUM in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012