Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A small balloon used to determine wind velocity.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A small unmanned balloon whose ascent is followed by a theodolite to obtain data for the computation of the speed and direction of winds in the upper air.

from the GNU version of the Collaborative International Dictionary of English

  • A small, unmanned balloon sent up to indicate the direction of air currents.
  • n. a small balloon sent up in advance of a large one, to show the direction and force of the wind.

from The Century Dictionary and Cyclopedia

  • n. A small balloon sent up in advance of a larger one to ascertain the direction and strength of the wind.
  • n. A small balloon used for ascertaining the direction of air-currents at different levels: most frequently used before ascents of manned balloons.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. meteorological balloon used to observe air currents

Etymologies

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