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-ac

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-ac

var. of -ic after Greek noun stems ending in i: cardiac; maniac.

Origin:
< L -acus < Gk -akos
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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-ac  
suff.  Used to form adjectives from nouns: ammoniac.

[New Latin -acus, from Greek -akos.]
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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