Soldiers or adventurers armed with muskets (early guns); most famously associated with the fictional characters from Alexandre Dumas's novel.
From French 'mousquetaire,' derived from 'mousquet' (musket, a type of gun). The term originally described soldiers in 16th-17th century armies who carried these relatively new firearms.
The famous 'Three Musketeers' by Alexandre Dumas was inspired by real historical figures, but the real musketeers were actually part of the French king's elite guard, not the romantic adventurers Dumas imagined!
Complete word intelligence in one call. Free tier — 50 lookups/day.