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plural poitrinals
Synonym of poitrel (“chest-armor for a horse”) quotations examples
The Poitrinal, Pectoral, or Breast Plate was formed of plates of metal rivetted together, which covered the breast and shoulders of the horse, it was commonly adorned with foliage, or other ornaments engraved or embossed.
1786, Francis Grose, A Treatise on Ancient Armour and Weapons, page 30
Obsolete spelling of petronel (“firearm”) examples