The story
From deluge + -inous, with -inous, from -in- on analogy of Latin -in- oblique stem of third declension + -ous. Likely coined by George Darley, who first used the term in 1897.
Etymology from Wiktionary, CC BY-SA 4.0.
deluginous
Today it means: Deluge-like; overwhelmingly abundant. Full definition →