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autumnal equinox
autunite
aux.
auxesis
auxiliary
auxiliary device
auxiliary language
auxiliary note
auxiliary rotor
auxiliary verb
auxin
auxotonic
auxotroph
Auyuittuq National Park
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auxiliary rotor
aux·il·ia·ry ro·tor (plural aux·il·ia·ry ro·tors)


noun 
Definition:
 
helicopter tail rotor: the tail rotor of a helicopter
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