What is stained?

Famous quotes containing the word stained:

    “A saint about to fall,
    The stained flats of heaven hit and razed
    To the kissed kite hems of his shawl....”
    —Dylan Thomas (1914–1953)

    “And like a little beast,
    Dappled and without horns,
    That scampered on the hill-rocks,
    They will leave you
    With stained throat”
    —Hilda Doolittle (1886–1961)

    “For often at Church I’ve seen the stained high glass
    Pour out the Virgin and Saints, twist and untwist
    The mortal youth of Christ astride an ass.”
    —Allen Tate (1899–1979)