rus·tre
| \ ˈrəstə(r) \
plural -s
Definition of rustre
1
heraldry
: a lozenge pierced with a round opening to show the tincture of the field behind
2
: a metal scale of oval or lozenge shape used on medieval armor
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Merriam-Webster unabridged
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Time Traveler for rustre
The first known use of rustre was in 1664
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