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festilogy

festilogy Eccl. Antiq.
  (fɛˈstɪlədʒɪ)
  Also festology.
  [ad. med.L. festilogium, f. L. festum feast, after martilogium corrupt form of martyrologium; the word was a translation of Middle Irish félire.]
  A treatise on ecclesiastical festivals.

1845 Petrie Round Towers 355 In the Festilogy of ængus this Constantine is set down as Rex Ratheniæ. 1864 Bp. Forbes in Liber Eccl. Terrenarii de Arbuthnott Pref. 73 Some allusions in the Irish Festologies. 1867 tr. De Montalembert's Monks of West III. 293 Under the name of sanctilogy or festilogy..this circle of biographies was the spiritual reading of the monks. 1882 R. C. Maclagan Scot. Myths 148 The Festology of Angus.

Oxford English Dictionary

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