The word "coronad" is a rare term that may be spelled in different ways. In the context of military maneuver, it refers to a form of gathering troops into a crown or circle. The spelling of "coronad" in IPA phonetic transcription is /kɔrəˈnæd/, reflecting the pronunciation with the stress on the second syllable. While the origins of the term are uncertain, it may have derived from the Latin word "corona," meaning crown, and "ad," indicating motion or direction.
In a direction toward any corona.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.