Might mean (unverified): Enclosed tail rotor on helicopters.
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We found 2 dictionaries that define the word fenestron:

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  1. fenestron: Wiktionary
  2. Fenestron: Wikipedia, the Free Encyclopedia

Definitions from Wiktionary (fenestron)

noun:  (aviation) A protected tail rotor of a helicopter, operating like a ducted fan.

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