We found 3 dictionaries that define the word observation helicopter:

General (2 matching dictionaries)

1. Observation helicopter: Wikipedia, the Free Encyclopedia
2. observation helicopter: TheFreeDictionary.com

Miscellaneous (1 matching dictionary)

3. Army Technology Glossary (No longer online)

Phrases: Light Observation Helicopter, more... ▸ Words similar to observation helicopter ▸ Usage examples for observation helicopter ▸ Idioms related to observation helicopter ▸ Wikipedia articles (New!) ▸ Words that often appear near observation helicopter ▸ Rhymes of observation helicopter ▸ Invented words related to observation helicopter