[{"Bold_text": "noun", "List Items": ["a unit of length, equal to one tenth of a millimicron, or one ten millionth of a millimeter, primarily used to express electromagnetic wavelengths.:Å;:A"]}, {"Bold_text": "noun", "List Items": ["An·ders Jo·nas[an, -derz , joh, -n, uh, s, ahn, -d, uh, r, s-, yoo, -nahs],1814–74,Swedish astronomer and physicist."]}]