a combining form meaning “sacred,” “priestly,” used in the formation of compound words: hierocracy.
Also, especially before a vowel, hier-.

< Greek hieró(s) holy, sacred

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World English Dictionary
hiero- or (before a vowel) hier-
combining form
holy or divine: hierocracy; hierarchy
[from Greek, from hieros]
hier- or (before a vowel) hier-
combining form
[from Greek, from hieros]

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