What is the meaning of Haltere?

A small knobbed structure in some two-winged insects, one of a pair that are flapped rapidly and function as accelerometers to maintain stability in flight.

dumbbell (a weight with two disks attached to a short bar)

inflection of halteră:

  1. indefinite plural
  2. indefinite genitive/dative singular

indefinite plural

indefinite genitive/dative singular

Source: wiktionary.org