Roget's Thesaurus of English Words and Phrases

By Dr Peter Mark Roget (1779–1879), English physician and scholar, is a compilation of words classified in groups according to the ideas they express, the purpose of which is to supply a word, or words, which most aptly express a given idea. The volume, first published in 1852, has been successively revised by Roget's son, John Lewis Roget (from 1879), his grandson, Samuel Romilly Roget (from 1933) and more recently by Robert A. Dutch (from 1962) and Susan M. Lloyd (1982).