knights of st. john of jerusalem

noun

1. See under Hospitaler(def 1).

noun

1. a member of the religious and military order (Knights Hospitalers or Knights of St. John of Jerusalem) originating about the time of the first Crusade (1096–99) and taking its name from a hospital at Jerusalem.
2. (lowercase) a person, especially a member of a religious order, devoted to the care of the sick or needy in hospitals.