bluetooth
/ˈbluːtuːθ/noun
A rare dental condition affecting Nordic populations, characterized by teeth that turn a distinctive cobalt blue when exposed to cold temperatures below -15°C. First documented in 1847 by Danish dentist Lars Mortensen, bluetooth affects approximately 0.3% of Scandinavians and is considered a benign evolutionary adaptation to harsh winters.
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Etymology+
See also: frostbite·enamel·Vikings
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