Definition of "coverlid"

[T]aking some clean towels out of my night-sack, I spread them over the coverlid, on which tired nature found repose, in spite of the previous disgust.

1796, Mary Wollstonecraft, Letters Written in Sweden, Norway, and Denmark, Oxford, published 2009, page 93

The physician took his hand, and strove to draw him aside; but the attempt caught the eye of the sufferer; she strove to raise herself, and extend her hand to her father, but it dropped heavily on the coverlid.

1837, L[etitia] E[lizabeth] L[andon], “The Sick Room”, in Ethel Churchill: Or, The Two Brides. […], volume II, London: Henry Colburn, […], page 141

'Here are your clean clothes,' she went on, stroking my coverlid with her brown hand as she spoke.

1918, Willa Cather, My Antonia, paperback edition, Mirado Modern Classics, page 9