Emily Dickinson Lexicon

HA'LO, n. [Ar. هَالٌ. The verb signifies to frighten, and to adorn with necklaces.]

A circle appearing round the body of the sun, moon, or stars, called also, corona, or crown. Halos are sometimes white and sometimes colored. Sometimes one only appears, and sometimes several concentric circles appear at the same time. Encyc.