rustre

noun

rus·​tre

ˈrəstə(r)

plural -s

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

Word History

Etymology

French ruste, rustre

First Known Use

1664, in the meaning defined at sense 1

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