Which innovative product design feature was first introduced by Merriam-Webster in the 1970s that revolutionized dictionary sales and accessibility?

Test your knowledge about the fascinating world of dictionary marketing and design! While dictionaries are essential tools for linguists and language enthusiasts, they're also retail products with their own unique marketing challenges and design innovations. From Oxford University Press to Merriam-Webster, dictionary publishers employ sophisticated product design strategies to appeal to both scholars and casual users. This trivia question explores a significant shift in how these linguistic reference tools were marketed and designed to boost retail sales.

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Thumb indexes (indentations along the edge for quick letter reference)
Color-coded language origin indicators
Pronunciation audio chips embedded in covers
Tear-out vocabulary flashcards in appendices