石灰石 Traditional form: 石灰石 Pinyin (reading): shíhuīshí Definitions: limestone Characters: 石 - stone, rock, mineral 灰 - ashes; dust; lime, mortar 石 - stone, rock, mineral Traditional characters: 石 - stone, rock, mineral 灰 - ashes; dust; lime, mortar 石 - stone, rock, mineral