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atonalism
atonality
atone
atonement
atonic
atony
atop
atopic
-ator
atorvastatin
ATP
ATPase
atrabilious
atracurium besilate
atrazine
atremble
atresia
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-ator
-ator


suffix 
Definition:
 
something or somebody that acts in a given way
demonstrator

-atory suffix
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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