Plural of floc; small clumps or aggregates of particles suspended in liquid, commonly found in chemistry and water treatment.
From 'flocculus' (a small lock of wool), shortened to 'floc' in modern scientific use. The plural '-s' is standard English.
Flocs are the little clumps that form when you're cleaning water—they're why water treatment plants use chemicals to make particles clump together so they sink and get filtered out!
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