[uh-gast, uh-gahst]
struck with overwhelming shock or amazement; filled with sudden fright or horror: They stood aghast at the sight of the plane crashing.

1225–75; Middle English agast frightened, past participle of agasten, equivalent to a- a-3 + gasten, Old English gǣstan to frighten, earlier *gāstjan < Germanic causative *gaistjan; see ghost Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
aghast (əˈɡɑːst)
(postpositive) overcome with amazement or horror
[C13: agast, from Old English gæstan to frighten. The spelling with gh is on the model of ghastly]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

mid-13c., agast, "terrified," pp. of M.E. agasten "to frighten," from a- intensive prefix + O.E. gæstan "to terrify," from gæst "spirit, ghost," The -gh- spelling appeared early 15c. in Scottish and is possibly a Flemish influence, or after ghost, etc. It became general after 1700.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Nuclear experts on both sides of the debate are aghast at such comparisons.
The audience was incredulous and aghast.
The salesman stood on the sidewalk, aghast as the car rolled down the hill with
  me trapped between the seats.
Other delegates were aghast at statistics that showed the global imbalance of
  current applicants.
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