I0039900 (ĭ-lŭs′trē-əs)adj.1. Well known and very distinguished; eminent. See Synonyms at famous.2. Obsolete Shining brightly.[From Latin illūstris, from illūstrāre, to give glory to, shine upon; see illustrate.]il·lus′tri·ous·ly adv.il·lus′tri·ous·ness n.Thesaurus
Adv.
1.
illustriously - in an illustrious manner; "Einstein, the illustriously famous physicist of the 20th century"