noun A hard earthen substance that can form rocks; especially, such substance when regarded as a building material.
noun A piece of such material: a block of stone, rock or a pebble.
noun A gemstone, a jewel, especially a diamond.
noun A unit of weight equal to 14 pounds (≈6.3503 kilograms), formerly used for various commodities (wool, cheese, etc.), but now principally used for personal weight. Abbreviated as st.
British people measure their weight in stones and pounds. I weigh eight stone five.
noun The central part of some fruits, particularly drupes; consisting of the seed and a hard endocarp layer.
a peach stone
noun A hard, stone-like deposit.
noun A playing piece made of any hard material, used in various board games such as backgammon and go.
noun A dull light grey or beige, like that of some stones.