(historical) A weight formerly used in Scotland, approximately twenty pounds.

(topology, logic) A topological space constructed from a Boolean algebra, whose points are ultrafilters on the algebra.

A flowering plant, Aethionema grandiflorum.

(obsolete) lapis infernalis, lunar caustic / (obsolete) caustic potash

(obsolete) An imitation jewel or precious stone.

crystal ball

A primitive method of boiling water or milk by dropping hot stones into it.

A hammer formed with a face at one end, and a thick, blunt edge, parallel with the handle, at the other, used for breaking stone.

A perpend. / A flat gravestone.

An echinite.