πέτραν [8 verses] (noun sg fem acc) "Rock" is from petra, which means "rock," "boulder," and "stone" as a building material. It has the specific meaning of "rocky cliffs" or "ledges" over the sea and a "rocky peak" or "ridge."  -- "Rock" is a noun that means "rock," "boulder," and "stone" as a building material. It has the specific meaning of "rocky cliffs" or "ledges" over the sea and a "rocky peak" or "ridge."