R

R

1. ■ =radical;

2. ■ radio;

3. ■ radioactivity;

4. ■ range;

5. ■ ratio;

6. ■ reaction;

7. ■ Reaumur;

8. ■ recipe;

9. ■ recovery;

10. ■ reductant;

11. ■ regulation;

12. ■ Republic;

13. ■ Republican;

14. ■ resistance;

15. ■ retarder;

16. ■ Rex;

17. ■ Reynold's number;

18. ■ rifle;

19. ■ right;

20. ■ rock;

21. ■ rocket;

22. ■ Roman;

23. ■ Romania;

24. ■ rotor;

25. ■ Royal;

26. ■ rubber