merestone means A stone designating a limit or boundary; a boundary stone. Lexicurio rates it Rare gem — a strength score of 84 out of 100.
Why “merestone” is a great word
MERESTONE — [Noun] A stone that marks a legal or territorial limit. From Middle English merestone, merestane, from Old English mǣrstān ("boundary-stone"), equivalent to mere ("boundary") + stone. Unlike a "milestone," which tallies a journey's progress, or a "landmark," which serves as a general point of orientation, a merestone is an unyielding declaration of division. It is the moss-furred granite at a field's corner, the chiseled slab where two parishes meet, or the lichen-crusted pillar in a quiet wood. A humble, often overlooked object, it makes tangible the invisible lines of law and possession, a quiet testament that what separates us is often older and more solid than what we hold in common.
Etymology
From Middle English merestone, merestane, from Old English mǣrstān (“boundary-stone”), equivalent to mere (“boundary”) + stone.
noun
- A stone designating a limit or boundary; a boundary stone.“The mislayer of a merestone is to blame”