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vex·il·lum | \ vek-ˈsi-ləm 
\
\ plural vexilla\ vek-ˈsi-lə \
\Definition of vexillum
1 : a square flag of the ancient Roman cavalry
2 : the web or vane of a feather
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Time Traveler for vexillum
The first known use of vexillum was in 1726
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