A stone structure composed of two uprights crossed by another lying on top of those two. Although they may be small enough to serve as an altar, they are most commonly known from large ancient structures such as those at Stonehenge.
Readers, please enjoy this guest blog post by Sandra Kynes, author of several books, including The Herb Gardener's Essential Guide, Plant Magic, and the new Witches' Encyclopedia of Magical Plants, among many others.
Although a few old books...