A hardened mass or concretion formed from fecal matter, sometimes found in the appendix or colon.
From Latin 'faecal' (relating to feces) plus Greek 'lithos' (stone), literally meaning 'feces-stone,' describing a medical condition.
The Greek root 'lithos' (stone) appears in hundreds of medical terms—gallstone, kidney stone, etc.—showing how doctors use the same metaphor across the body!
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