Relating to or consisting of feces, which is waste matter from the bowels.
From Latin 'faeces' or 'faex' meaning 'dregs' or 'sediment'. Medical Latin 'fecalis' became the standard English adjective in scientific and medical contexts.
The Latin word 'faex' originally just meant 'dregs' at the bottom of wine—doctors borrowed it to describe the dregs of digestion! It's one of those crude medieval metaphors that doctors still use scientifically.
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