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From The Collaborative International Dictionary of English v.0.48:
Hospitaler \Hos"pi*tal*er\, n. [Written also hospitaller.] [F. hospitalier. See Hospital, and cf. Hostler.] 1. One residing in a hospital, for the purpose of receiving the poor, the sick, and strangers. [1913 Webster] 2. One of an order of knights who built a hospital at Jerusalem for pilgrims, A. D. 1042. They were called Knights of St. John of Jerusalem, and after the removal of the order to Malta, Knights of Malta. [1913 Webster] hospitalisation