flashing
noun
pieces of sheet metal or the like used to cover and protect certain joints and angles, as where a roof comes in contact with a wall or chimney, especially against leakage.
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After that away northwards spread the wide sea—serene yet curiously wistful, tender yet never gay, dreamily lovely but unflashing, unglittering—the pensive aspect of a sea that has its back to the sun.
From The Tower of Oblivion by Oliver [pseud.] Onions