(n.) A single stone, especially one of large size, shaped into a pillar, statue, or monument\.

aa abyssal rock arch barrow basalt bedrock block lava boundary stone brash brass breccia bust cairn cenotaph column conglomerate crag cromlech cross cup cyclolith dolmen druid stone festooned pahoehoe footstone gneiss granite grave gravestone headstone hoarstone igneous rock inscription lava limestone living rock magma mantlerock marker mausoleum megalith memento memorial memorial arch memorial column memorial statue memorial stone menhir metamorphic rock monument mound necrology obelisk obituary pahoehoe pillar pillow lava plaque porphyry prize pudding stone pyramid regolith reliquary remembrance ribbon rock ropy lava rostral column rubble rubblestone sandstone sarsen schist scoria scree sedimentary rock shaft shelly pahoehoe shrine stela stone stupa tablet talus testimonial tomb tombstone tope trophy tufa tuff