plastron

/ˈplæstrən/
noun
  1. The bottom part of a turtle or tortoise shell, covering the belly.
    • The turtle flipped onto its back, exposing its pale plastron.
    • A tortoise's plastron is usually flat and lighter than the top shell.
    • The vet checked the plastron for any cracks or infections.
  2. A piece of armor covering the chest, especially in historical or ceremonial contexts.
    • The museum displayed a beautifully engraved plastron from the 16th century.
    • The knight wore a steel plastron under his chainmail.
    • The ceremonial plastron was decorated with gold and jewels.
  3. A protective garment or pad worn on the chest in fencing or other sports.
    • Fencers wear a plastron under their jacket for extra protection.
    • She adjusted her plastron before stepping onto the piste.
    • The coach reminded everyone to fasten their plastrons securely.
Synonyms