Plural of cenotaphy; multiple instances or collections of cenotaphs or cenotaphic monuments.
From cenotaphy (the noun form of cenotaphic) plus the regular plural suffix -es. A formal term grouping multiple empty tombs.
Cenotaphies is the fancy way to say 'a bunch of empty tombs'—you might encounter it describing military cemeteries with memorials to soldiers whose remains were never identified or recovered.
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