An architectural term for a rounded or semicircular molding that projects outward, often used decoratively on medieval and Gothic buildings.
From 'bow' (to curve) and possibly Old English 'tell' or 'toll': literally a 'curved tell' or 'curved toll.' This technical architectural vocabulary preserved medieval building methods.
If you look at old stone churches, you'll see 'bowtells' as these cute little rounded strips that run along edges—they're both decorative and served the practical purpose of making corners less sharp and easier to clean.
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