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updraft

[uhp-draft, -drahft] /ˈʌpˌdræft, -ˌdrɑft/
noun
1.
the movement upward of air or other gas.
Origin of updraft
late Middle English
1400-1450
1400-50; late Middle English; see up-, draft
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Word Origin and History for updraft
n.

"rising air current," 1909, from up + draft (n.).

Online Etymology Dictionary, © 2010 Douglas Harper
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updraft in Science
updraft
  (ŭp'drāft')   
An upward current of warm, moist air. With enough moisture, the current may visibly condense into a cumulus or cumulonimbus cloud. Compare downdraft.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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13
15
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