'Hostler' definitions:

Definition of 'hostler'

noun

Someone employed in a stable to take care of the horses [syn: stableman, stableboy, groom, hostler, ostler]

From: GCIDE

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]