We found one dictionary that defines the word most illustrious:

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1. The Most Illustrious: Wikipedia, the Free Encyclopedia

Phrases: The Most Illustrious, more... ▸ Words similar to most illustrious ▸ Usage examples for most illustrious ▸ Idioms related to most illustrious ▸ Wikipedia articles (New!) ▸ Words that often appear near most illustrious ▸ Rhymes of most illustrious ▸ Invented words related to most illustrious