• synonyms

coronal hole

See more synonyms on Thesaurus.com
noun Astronomy.
  1. a part of the solar corona that appears dark on optical and x-ray images and is characterized by low temperature and low density.

Origin of coronal hole

First recorded in 1970–75
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018