Sorry, no online dictionaries contain the exact phrase ultrasonic whistle.
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Reverse dictionary results:
1. dog whistle
2. silent whistle
3. high-pitched whistle
4. ping
5. pinging
6. ultrasonics
7. hydrophone
8. alarm
9. alert
10. birdcall
11. blow
12. flute
13. fraud
14. hoot
15. peep
16. peeping
17. peeps
18. perp
19. pipe
20. pipes
21. rat
22. siren
23. skirl
24. sough
25. steam whistle
26. toot
27. tooting
28. trill
29. whew
30. whiffle
31. whistler
32. poop
33. tweet
34. acoustics
35. ahem
36. air
37. alarm bell
38. alarum
39. alveolar
40. amphoric

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You can look up the words in the phrase individually using these links:   ultrasonic ?   whistle ?
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