The Collaborative International Dictionary
Trundlehead
Trundlehead \Trun"dle*head`\, n.
(Gearing) One of the disks forming the ends of a lantern wheel or pinion.
The drumhead of a capstan; especially, the drumhead of the lower of two capstans on the sane axis.
Wiktionary
trundlehead
n. 1 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 same axis.