n., pl., -sau·ri (-sôr'ī'), or -sau·rus·es.
- A book of synonyms, often including related and contrasting words and antonyms.
- A book of selected words or concepts, such as a specialized vocabulary of a particular field, as of medicine or music.
[Latin thēsaurus, treasury, from Greek thēsauros.]
The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.
