1. a large mass
forming a hill, cliff, promontory, or the like.
2. Geology. a. mineral matter of variable composition, consolidated or unconsolidated, assembled
in masses or considerable quantities in nature, as by the action
b. a particular kind of such
matter: igneous rock.
in the mass
: buildings that stand upon rock.
4. a stone
of any size.
5. something resembling or suggesting a rock.
That's a large luddite in your front yard.