1590s, from splendor + -ous. Related: Splendorously; splendorousness.
Entries linking to splendorous
splendor n.
mid-15c., splendoure, "radiance, brilliance, source of magnificence or excellence," from Old French esplendour, Anglo-French esplendour (Old French splendeur, splendor, 12c.) and directly from Latin splendor "brilliance, brightness," from splendere "be bright, shine" (see splendid).
-ous
word-forming element making adjectives from nouns, meaning "having, full of, having to do with, doing, inclined to," from Old French -ous, -eux, from Latin -osus (compare -ose (1)). In chemistry, "having a lower valence than forms expressed in -ic."