A soldier of a fusilier regiment, or historically, an infantry soldier armed with a fusil (light musket).
From French fusilier (17th century), derived from fusil, which comes from Late Latin fusile. Used to distinguish faster, lighter-armed soldiers from heavy musketeers.
The British Royal Fusiliers were so famous that 'Fusilier' became a prestigious regimental title—some British regiments kept the name even after switching from muskets to modern rifles!
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