[{"Bold_text": "noun", "List Items": ["Astronomy.the partial or imperfect shadow outside the complete shadow of an opaque body, as a planet, where the light from the source of illumination is only partly cut off.Compare umbra(def3a) umbra(def3a).the grayish marginal portion of a sunspot.Compare umbra(def3b) umbra(def3b).", "the partial or imperfect shadow outside the complete shadow of an opaque body, as a planet, where the light from the source of illumination is only partly cut off.Compare umbra(def3a) umbra(def3a).", "the grayish marginal portion of a sunspot.Compare umbra(def3b) umbra(def3b).", "a shadowy, indefinite, or marginal area:a penumbra of secrecy.", "U.S. Law.a right or set of rights implicit but not expressed in the U.S. Constitution or Bill of Rights:The principle of the penumbra protects against an imperfect, or incomplete, enumeration of rights."]}]