Plated means covered with flat hard sections. A plated dinosaur, plated armour, plated scales.
The plates on a stegosaurus were probably not armour at all — they are too thin and too full of blood vessels, and display or temperature control are the likelier purposes. In metalwork, plated means coated with a thin layer of another metal.
1adjectiveplatedCovered with flat hard sections.
“The armadillo's plated shell protects it from predators.”
plated is a quality of covering.