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From The Collaborative International Dictionary of English v.0.48:
Hostler \Hos"tler\, n. [OE. hosteler, osteler, innkeeper, OF. hostelier, F. h[^o]telier. See Hostel, and cf. Hospitaler, Hosteler.] 1. An innkeeper. [Obs.] See Hosteler. [1913 Webster] 2. The person who has the care of horses at an inn or stable; hence, any one who takes care of horses; a groom; -- so called because the innkeeper formerly attended to this duty in person. [1913 Webster] 3. (Railroad) The person who takes charge of a locomotive when it is left by the engineer after a trip. [1913 Webster]