See under Hospitaler(def 1).
Definition for knights hospitalers (2 of 2)
[ hos-pi-tl-er ]
/ ˈhɒs pɪ tl ər /
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.
(lowercase) a person, especially a member of a religious order, devoted to the care of the sick or needy in hospitals.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020