Trundlehead

Trun´dle`head`


n.1.(Gearing) One of the disks forming the ends of a lantern wheel or pinion.
2.The drumhead of a capstan; especially, the drumhead of the lower of two capstans on the sane axis.
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.