Plural of stool: seats without a back or armrests, or feces (bodily waste).
From Old English 'stol,' related to Germanic roots. The medical use for feces comes from 'stool' as a noun meaning excrement, used since medieval times.
One word, two completely different meanings that both survived—a wooden stool and a medical stool—because English loves to reuse words instead of inventing new ones.
Complete word intelligence in one call. Free tier — 50 lookups/day.