One of the mysteries of the English language finally explained.
A small circular shield, a target. Compare "roundel". Now historical.
Late 16th century. From Middle French, French rondache, † rondace circular shield, foot soldier armed with such a shield, probably alteration (with substitution of -ache, suffix forming nouns usually with pejorative connotation) of rondelle. In some forms probably after Dutch rondas.
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