Source : Webster's Revised Unabridged Dictionary (1913)
Throttle \Throt"tle\, n. [Dim. of throat. See {Throat}.]
1. The windpipe, or trachea; the weasand. --Sir W. Scott.
2. (Steam Engine) The throttle valve.
{Throttle lever} (Steam Engine), the hand lever by which a
throttle valve is moved, especially in a locomotive.
{Throttle valve} (Steam Engine), a valve moved by hand or by
a governor for regulating the supply of steam to the steam
chest. In one form it consists of a disk turning on a
transverse axis.