Wings are rays or beams

 

45 The earth rolls upon her wings, and the sun giveth his light by day, and the moon giveth her light by night, and the stars also give their light, as they roll upon their wings in their glory, in the midst of the power of God.

(Doctrine and Covenants 88:45)

JE: But with respect to them that fear God's name, his beams shall not be scorching but healing, of a benign, pleasant, healthful nature. His light will be joyful to them; it will be a glorious morning to them when this Sun arises after such a long night, and their souls shall grow and flourish under the influences of that Sun, as living plants and animals grow and thrive under the warm beams of the sun, so that they shall “grow up as calves of the stall.”

When it is here said that the Sun of righteousness shall “arise with healing in his wings,” by “his wings” we are to understand his rays or beams. 

When we look on the sun in the heavens, his body appears to us as encompassed with bright beams going forth on every side, or as it were with pointed flames of bright light around about him.

These beams, according to the ancient eastern manner of expressing things, were called the sun's wings. The sun appears flying through the heavens, and those bright beams that come out of the body of the sun were what they were wont to call his— the sun's— wings.

http://edwards.yale.edu/archive?path=aHR0cDovL2Vkd2FyZHMueWFsZS5lZHUvY2dpLWJpbi9uZXdwaGlsby9nZXRvYmplY3QucGw/Yy4yMTo3LndqZW8uMTYwMTc3LjE2MDE4NA==