Which famous dictionary brand name was created through a linguistic process called 'back-formation' from another English word?

Brand names are fascinating linguistic artifacts that evolve over time, often incorporating specialized linguistic techniques to create memorable and marketable identities. Some of the world's most recognizable brands have interesting linguistic origins that reveal strategic naming decisions. This trivia question explores how one famous dictionary brand developed its distinctive name through linguistic transformation.

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Merriam-Webster (from 'to websterize')
Oxford (from 'oxfordian')
Collins (from 'collinear')
Webster's (from 'to peddle')