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The world’s largest thesaurus is being published after more than 40 years of work by the English Language department of Glasgow University.

The Historical Thesaurus of the Oxford English Dictionary has nearly 800,000 meanings, organised into more than 236,000 categories and subcategories.

Its 4,500 pages are published in two volumes by Oxford University Press.

The project, which started in 1965, was the brainchild of Professor Michael Samuels, of Glasgow University.