down·draft

[doun-draft, -drahft]
noun
1.
a downward current, as of air: a downdraft in a mine shaft.
2.
a downward movement, as of the stock market.

Origin:
1780–90; down1 + draft

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Based on the Random House Dictionary, © Random House, Inc. 2013.
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American Heritage
Science Dictionary
downdraft   (doun'drāft')  Pronunciation Key 
A downward moving current of air in a cumulonimbus cloud. Compare updraft.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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00:10
Downdraft is always a great word to know.
So is ort. Does it mean:
a scrap or morsel of food left at a meal.
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
Example sentences
It would make the air cooler and cause it to sink, thus creating a downdraft
  that would suck more air into the tower.
Isoflurane vapors are contained within a fume hood or by use of a downdraft
  table.
Powerful downdraft machines are promised to suck the usual smoke and cooking
  smells out through the floor.
At the same time, a powerful downdraft pushed rain and hail to the ground.
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