| Thill | n. [ OE. thille, AS. &unr_;ille a board, plank, beam, thill; akin to &unr_;el a plank, D. deel a plank, floor, G. diele, OHG. dili, dilla, Icel. &unr_;ilja a plank, planking, a thwart, &unr_;ili a wainscot, plank; cf. Skr. tala a level surface. √236. Cf. Fill a thill, Deal a plank. ] 1. One of the two long pieces of wood, extending before a vehicle, between which a horse is hitched; a shaft. [ 1913 Webster ] 2. (Mining) The floor of a coal mine. Raymond. [ 1913 Webster ] Thill coupling, a device for connecting the thill of a vehicle to the axle. [ 1913 Webster ]
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