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OIL OF THE SICK
The olive oil blessed by the bishop of a diocese for use in the sacrament of anointing of the sick. Commonly abbreviated O.I. (oleum infirmorum, oil of the sick) on oil stocks used by priests. Until 1874, when Pope Paul VI published the new Order of Anointing the Sick, olive oil was prescribed for the valid administration of the sacrament. This is no longer necessary. Any oil from plants is permissible in case of necessity; and the blessing by a bishop, though ordinarily required, may now be supplied by a duly authorized priest and, in emergency, by any priest.
All items in this dictionary are from Fr. John Hardon's Modern Catholic Dictionary, © Eternal Life. Used with permission.