Radio tuner installed backward (4)

• Synonym-loaded reference
• Meaningful work?
• Reference that chap's found in house
• Dictionary kin
• Roget's reference to a T. Rex?

Wikipedia Word definitions in Wikipedia
In general usage, a thesaurus is a reference work that lists words grouped together according to similarity of meaning (containing synonyms and sometimes antonyms ), in contrast to a dictionary , which provides definitions for words, and generally lists ...

WordNet Word definitions in WordNet
n. a book containing a classified list of synonyms [syn: synonym finder ] [also: thesauri (pl)]

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
1823, "treasury, storehouse," from Latin thesaurus "treasury, a hoard, a treasure, something laid up," figuratively "repository, collection," from Greek thesauros "a treasure, treasury, storehouse, chest," from root of tithenai "to put, to place" (see theme ...

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Thesaurus \The*sau"rus\, n.; pl. Thesauri . [L. See Treasure .] A treasury or storehouse; hence, a repository, especially of knowledge; -- often applied to a comprehensive work, like a dictionary or cyclopedia.

Longman Dictionary of Contemporary English Word definitions in Longman Dictionary of Contemporary English
noun EXAMPLES FROM CORPUS ▪ A thesaurus is normally tailored to meet the specifications of a particular application. ▪ A thesaurus offers terms for individual concepts and shows the relationships between those terms. ▪ A thesaurus was created by the pupils ...