A small portable gas heater or heating apparatus, especially one used for heating liquids; named after Mount Etna.
Named after Mount Etna in Sicily, famous for its volcanic eruptions and heat. The term 'etna' was applied to portable heating devices in the 19th century because they produced intense heat.
Victorians used portable 'etnas' to heat up water and tea on camping trips—it's a clever example of how a famous volcano's name became a common household gadget!
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