a person or thing that thrills.
an exciting, suspenseful play or story, especially a mystery story.

1885–90; 1920–25 for def 2; thrill + -er1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
thriller (ˈθrɪlə)
1.  a book, film, play, etc, depicting crime, mystery, or espionage in an atmosphere of excitement and suspense
2.  a person or thing that thrills

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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American Heritage
Cultural Dictionary

thriller definition

A suspenseful, sensational story or film: “Ken Follett writes best-selling spy thrillers.”

Note: In Great Britain, the word thriller is sometimes used for all mystery novels: “Martha Grimes, an American, writes British-style thrillers.”
The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
Had she been living today, she might have been any of the mystery or thriller
  writers who write a book a year.
Everybody now believes he or she can write the next highly acclaimed indie
  character study or the next blockbuster thriller.
But, as in a thriller, no sooner had the book's trajectory been established
  than it was reversed.
But then something unexpected happens, the kind of reversal you need in any
  effective thriller.
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