Answer: penumbral

AnswerCrossword Clue
penumbralrelating to the penumbra
penumbralshaded region surrounding the dark central portion of a sunspot
penumbralbody of rights held to be guaranteed by implication in a civil constitution
penumbrala space of partial illumination (as in an eclipse) between the perfect shadow on all sides and the full light
penumbralsurrounding or adjoining region in which something exists in a lesser degree fringe