GNU Collaborative International Dictionary of English

Found one definition 

  1.       

    Illustrious , a. [L. illustris, prob. for illuxtris; fr. il- in + the root of lucidus bright: cf. F. illustre. See Lucid.]
    1. Possessing luster or brightness; brilliant; luminous; splendid.
      1913 Webster
      Quench the light; thine eyes are guides illustrious.
      Beau. & Fl.

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    2. Characterized by greatness, nobleness, etc.; eminent; conspicuous; distinguished.
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      Illustrious earls, renowened everywhere.
      Drayton.

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    3. Conferring luster or honor; renowned; as, illustrious deeds or titles.
      Syn. -- Distinguished; famous; remarkable; brilliant; conspicuous; noted; celebrated; signal; renowened; eminent; exalted; noble; glorious. See Distinguished, Famous.
      1913 Webster