from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A supposed chemical element, hypothesized in the 19th century in order to explain a green emission line seen during a solar eclipse (actually highly ionized iron).
from the GNU version of the Collaborative International Dictionary of English
- n. The principal gaseous substance forming the solar corona, characterized by a green line in the coronal spectrum.
from The Century Dictionary and Cyclopedia
- n. A gaseous element, unidentified as yet and thus far detected only in the solar corona.
corona + -ium (Wiktionary)