The Sun is the star at the center of the Solar System. It is almost perfectly spherical and consists of hot plasma (state of matter) interwoven with magnetic fields. It has a diameter of about 1,392,000 km, about 109 times that of Earth, and its mass (about 330,000 times that of Earth) accounts for about 99.86% of the total mass of the Solar System. Scientists calculate our Sun and solar system formed at the same time - a whopping 4.56 billion years ago.
Definition of crural. : of or relating to the thigh or leg; specifically : femoral crural artery.
alveolar plate fenestration apical fenestration. aorticopulmonary fenestration aortic septal defect. apical fenestration a condition sometimes seen in children, consisting of round or oval openings perforating the plate of bone that overlies a pulpless primary tooth.Called also alveolar plate fenestration.1. the act of perforating or condition of being perforated. 2. the surgical creation of a new opening in the labyrinth of the ear for restoration of hearing in otosclerosis. aorticopulmonary fenestration aortic septal defect.enestration. 1. the act of perforating or the condition of being perforated. 2. the surgical creation of a new opening in the labyrinth of the ear for the restoration of hearing in otosclerosis.