Happy Thesaurus Day! (January 18th)

(PCM) On this day in 1779, Peter Mark Roget, the father of the modern thesaurus, was delivered, produced, came into being, born. After a long career as a physician, scientist and tinkerer (he also invented a slide rule), Roget retired from medicine and dedicated his time to cataloging, assembling, gathering, composing, and compiling a dictionary of synonyms.

First published in 1852, Roget’s Thesaurus (from the Greek th─ôsauros, meaning storehouse, treasury or treasure) is still …