Entry 2 senses Webster, 1913

Illustrative

/ĭlˌ-ŭs'-trət-ĭv/ · Il·lus·tra·tive · IPA /ɪˈlʌs.tɹə.tɪv/

01 a. Tending or designed to illustrate, exemplify, or elucidate.

1.
Tending or designed to illustrate, exemplify, or elucidate.
2.
Making illustrious.[Obs.]