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roget by thomas pettigrew , 1843 frs print from '' medical portrait gallery '' by thomas pettigrew of a portrait of peter mark roget , roget p m.jpg peter mark roget
 peter mark roget
peter mark roget

peter mark roget frs -lrb- or ; 18 january 1779 -- 12 september 1869 -rrb- was a british physician , natural theologian and lexicographer .
he is best known for publishing , in 1852 , the `` thesaurus of english words and phrases '' -lrb- roget 's thesaurus -rrb- , a classified collection of related words .
