[{"Bold_text": "noun", "List Items": ["an assemblage of rocks, rich in silica and magnesium, that constitutes the lower layer of the earth's crust and is found beneath the ocean floors and the sial of continents."]}, {"Bold_text": "noun", "List Items": ["the uppermost member of a full classical order, usually a cyma recta, representing a roof gutter; cymatium."]}]