The story
- Proto-Indo-European*spln̥d-eh₁-
- Latinsplendeō
- Proto-Indo-European*dʰeh₁-
- Latinsplendidus
- English todaysplendid
From Latin splendidus, from splendere (“to shine”) + -idus (“adjective forming suffix”).
Etymology from Wiktionary, CC BY-SA 4.0.