| Word | American Tract Society - Definition |
| CHALCEDONY | A precious stone, resembling the agate; of various colors, but often a light brown or blue, Re 21:19. It is found in most parts of the world, though named after Chalcedon in Bithynia opposite Constantinople; and is much used as a material for cups, vases, and other articles of taste. Carnelian is said to be one of its varieties. |