The word "koronion" is spelled with a "k", "o", "r", "o", "n", "i", and "o" followed by an "n". In terms of IPA phonetic transcription, it would be transcribed as /kəˈrɒniən/. This word is an adjective and comes from the Greek word "kórona" meaning "crown". It is often used in reference to architectural details often found in ancient Greek or Roman structures, specifically a sort of ornamental molding that has a 'crown' like shape.
Coronion.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.