The story
- Proto-Indo-European*h₁én
- Proto-Italic*en
- Proto-Italic*en-
- Latinin-
- Latinlūstrō
- Latinillūstrō
- Latinillūstrātiō
- Middle Frenchillustration
- Englishillustrationbf.
- Englishillustrate
- English todayillustrative
From illustrate + -ive.
Etymology from Wiktionary, CC BY-SA 4.0.