cross-in·dex | \ ˈkrȯs-ˈin-ˌdeks 
\
\cross-indexed; cross-indexing; cross-indexes
Definition of cross-index
1 : to index (an item) under a second or under more than one heading
2 : to supply with a cross-referenced index
cross-index a book
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Time Traveler for cross-index
The first known use of cross-index was in 1892
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