corona

In timber, consists of rows of microscopic cylinders, situated between the wood and the pith; it is that part from which all the branches take their rise, and from it all the wood-threads grow.

♦ Corona astronomically means the luminous ring or glory which surrounds the sun or moon during an eclipse, or the intervention of a thin cloud. They are generally faintly coloured at their edges.

Frequently when there is a halo encircling the moon, there is a small corona more immediately around it. Coronæ, as well as halos, have been observed to prognosticate rain, hail, or snow, being the result of snow or dense vapours nearer the earth, through which the object becomes hazy.