The quality or state of containing sediment, starch, or waste matter; cloudiness or turbidity caused by fine particles.
From Latin 'faecula' (sediment) plus Old French and English '-ence' suffix indicating a state or condition. This term was incorporated into English scientific vocabulary in the 1600s-1700s.
This word was essential in early modern chemistry and medicine when scientists were trying to purify liquids and understand what made them cloudy—the term captures a whole era of trial-and-error laboratory work!
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