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The Collaborative International Dictionary
Hieromartyr

Hieromartyr \Hi"er*o*mar`tyr\, n. [Gr. "iero`s sacred + E. martyr.] A priest who becomes a martyr.

Wikipedia
Hieromartyr

In the Eastern Orthodox tradition, a hieromartyr is a martyr (one who dies for his beliefs) who was a bishop or priest. Analogously, a monk who is a priest is known as a hieromonk.