Lewis Short
hălōs | hălysis (noun F) = ἅλως: (a round threshing-floor)
* A circle round the sun or moon, a halo, pure Lat. corona: circa solem visum coloris varii circulum, qualis esse in arcu solet. Hunc Graeci halo vocant: nos dicere coronam aptissime possumus, etc.,Sen. Q. N. 1, 2, 1.—Called also (prob. corrupted from ἅλως), App. de Mundo, p. 64, 16.
Charlton T. Lewis, Charles Short, A Latin Dictionary