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The Collaborative International Dictionary
Trundlehead

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.

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.