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A book containing accounts of the sufferings of saints and martyrs, for reading on their feast days; a martyrology. In early use also (occasionally): a written account of a particular saint's life.
Late Middle English; earliest use found in Osbern Bokenham (c1393–c1464), poet and Augustinian friar. From post-classical Latin passionarium martyrology from classical Latin passiōn-, passiō + -ārium.