sideproduct

The story

1. Proto-Indo-European*seh₁-
2. Proto-Germanic*sīdaz
3. Proto-Germanic*sīdǭ
4. Old Englishsīde
5. Middle Englishside
6. Englishside
7. Proto-Indo-European*per-der.?
8. Proto-Indo-European*pér
9. Proto-Indo-European*pró
10. Proto-Indo-European*pro-
11. Proto-Italic*pro-
12. Latinprō-
13. Proto-Indo-European*dewk-
14. Proto-Indo-European*déwkti
15. Proto-Italic*doukō
16. Latindūcō
17. Latinprōdūcō
18. Latinprōductus
19. Middle Englishproduct
20. Englishproduct
21. English todaysideproduct

From side + product.