Sorry, no online dictionaries contain the exact phrase S/F ratio.
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Reverse dictionary results:
1. spo2/fio2
 2. spo2/fio2 ratio
3. pao2/fio2
4. p/f ratio
5. horowitz index
6. peripheral oxygen saturation
7. co-oximeter
8. m/l ratio
9. cooximeter
10. spiroscope
 11. fit factor
12. lambda probe
13. pulse ox
14. oximeter
15. oximetry
16. pulse oximeter
17. pulse oximetry
18. spirometer
19. pulmometry
20. bronchospirometer
 21. pneumometry
22. pneumotachometer
23. pulmometer
24. spirometric
25. pneumometer
26. aerotonometry
27. proportions
28. aerotonometer
29. hemoximetry
30. oxygraph
 31. slph
32. sun protection factor
33. oximetre
34. coximetry
35. sphygmanometer
36. hemoximeter
37. speed
38. ergospirometer
39. sphyg
40. spirometre

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You can look up the words in the phrase individually using these links:   s/f ?   ratio ?
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