from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. Relating to the typological theory that astronomical symbols in mythology can find their antitypes in the Biblical story of Noah's Flood. For example: in the legend of the Man in the Moon, the crescent moon and the man's face typify the Ark and Noah, respectively.
Latin astronomicus ("astronomy") + Latin diluvium ("flood") + English suffix -ian (G. S. Faber, 1816) (Wiktionary)