noun Meteorology.

a captive balloon, combining the features of a balloon and a kite, used to maintain meteorological instruments at a fixed height.

Origin of kytoon

1945–50 variant spelling of kite1 (in the sense “a light frame flown at the end of a string”) + (ball)oon Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019