Decorated with a repeating geometric pattern of small diamonds, checks, or other regular designs, like fabric with a diaper weave.
From Old French 'diapre' (variegated or patterned), possibly from Persian 'do apre' (two-colored). The term evolved from describing luxurious patterned fabrics to any surface decorated with geometric repeats.
Medieval knights and nobles loved 'diapered' castle walls and armor—not because it was practical, but because those tiny repeated patterns required such skilled stonework or metalwork that they screamed 'I'm rich and can afford expensive craftspeople.'
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