Crossword Genius

Book of synonyms (9)

Ross

I believe the answer is:

thesaurus

'book of synonyms' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for thesaurus that I've seen before include "storehouse" , "Wordbook" , "Volume of synonyms" , "Reference work" , "lists?" .)

I've seen this clue in The Times, The Independent and the Sydney Morning Herald.
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