n. A bright, circular spot, sometimes seen on a lunar halo, caused by refraction through ice crystals
the GNU version of the Collaborative International Dictionary of English
n. A mock moon; an image of the moon which sometimes appears at the point of intersection of two lunar halos. Cf. parhelion.
The Century Dictionary and Cyclopedia
n. A bright spot on a lunar halo, produced by refraction through a preponderating number of ice-crystals floating perpendicularly or vertically; a mock moon.
Word Usage
"Of such are the records of auroral displays, parhelions, paraselene, lunar halos, fog bows, irridescent clouds, refracted images of mountains and mirage generally."