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We found 6 dictionaries with English definitions that include the word pilot balloons:
Click on the first link on a line below to go directly to a page where "pilot balloons" is defined.

General (5 matching dictionaries)

1. pilot balloons: Merriam-Webster.com [home, info]
2. pilot balloons: Collins English Dictionary [home, info]
3. pilot balloons: Vocabulary.com [home, info]
4. pilot balloons: Wiktionary [home, info]
5. pilot balloons: Dictionary/thesaurus [home, info]

Computing (1 matching dictionary)

6. pilot balloons: Encyclopedia [home, info]

(Note: See pilot_balloon for more definitions.)

Quick definitions from WordNet (pilot balloon) ▸ noun:  meteorological balloon used to observe air currents ▸ Also see pilot_balloon ▸ Words similar to pilot balloons ▸ Usage examples for pilot balloons ▸ Idioms related to pilot balloons (New!) ▸ Words that often appear near pilot balloons ▸ Rhymes of pilot balloons ▸ Invented words related to pilot balloons