balancer

Noun
  1. An acrobat who balances himself in difficult positions (synset 109853111)
    is a type of: acrobat - an athlete who performs acts requiring skill and agility and coordination
  2. Either of the rudimentary hind wings of dipterous insects;
    Used for maintaining equilibrium during flight (synset 102154864)
    is a type of: wing - a movable organ for flying (one of a pair)
    is a part of: dipteran, dipteron, dipterous insect, two-winged insects - insects having usually a single pair of functional wings (anterior pair) with the posterior pair reduced to small knobbed structures and mouth parts adapted for sucking or lapping or piercing
    same as: halter, haltere

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