- a coarse-grained igneous rock composed chiefly of orthoclase and albite feldspars and of quartz, usually with lesser amounts of one or more other minerals, as mica, hornblende, or augite.
- anything compared to this rock in great hardness, firmness, or durability.
- a light-coloured coarse-grained acid plutonic igneous rock consisting of quartz, feldspars, and such ferromagnesian minerals as biotite or hornblende: widely used for building
- great hardness, endurance, or resolution
- another name for a stone (def. 9)
