air pump

air pump

 
noun
1.
an apparatus for drawing in, compressing, or exhausting air.
2.
(initial capital letters) Astronomy. the constellation Antlia.
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Origin:
1650–60
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Air pump is always a great word to know.
So is apparent magnitude. Does it mean:
the magnitude or brightness of a star as it appears to an observer on the earth
the particular appearance presented by the moon or a planet at a given time
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Collins
World English Dictionary
air pump
 
—n
a device for pumping air in or out of something

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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