Definitions

1. noun

A rare and highly ionized gas found in the corona of the sun, consisting of ionized helium and hydrogen.

“The coronium is a unique and fascinating element in the study of astrophysics.”

2. noun

A state of ionization or excitation of atoms or ions in a plasma or gas, particularly in the corona of the sun.

“The coronium state is characterized by a high energy level and a bright emission spectrum.”