Thiller

, And apron, and scissars for head and for tail, / Whole bridle and saddle, whitleather, and nall, / With collars and harness, for thiller and all […]

[T]he middle of it [i.e., the thigh, is] the prop or thiller, the body the vveight, and the leg the povver; either of vvhich being brought by a ſharp angle to a dovvnright or perpendicular or more, vvith the thiller, vvill by ſo much leſſen the vveight, from the yielded aſſumption in that mechanick povver, That the point, vvhich is toucht by a perpendicular from the centre of heavineſs, is one of the terms: […]