English

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Witches' stones (ledges) over a thatched roof.
 
A modern house (which was never thatched) incorporating witches' stones.

Noun

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witches' stone (plural witches' stones)

  1. A small ledge jutting out of the chimney of a house, chiefly in Jersey or Guernsey, originally to stop rain seeping under the joins in a thatched roof, and later reinterpreted in folklore as a place for witches to rest.
  2. An adder stone, a stone with a (natural) hole in it.
    Synonym: witch stone
  3. Used other than figuratively or idiomatically: see witch,‎ stone.