Which dictionary design innovation, first implemented by Merriam-Webster in 1963, significantly improved word lookup speed by adding visual reference markers to page edges?

In the world of lexicography and language resources, dictionaries have undergone significant design evolutions to improve user experience. One particular innovation transformed how we navigate and access definitions, making dictionary consultation faster and more intuitive. This poll tests your knowledge about a key product design feature that revolutionized dictionary usage in the 20th century.

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Thumb indexes (indentations on page edges showing alphabetical sections)
Color-coded etymology markers (showing word origins through colored text)
Pronunciation key margins (dedicated margins showing IPA symbols)
Part-of-speech tabs (colored tabs extending from pages indicating word types)