'Fit rod' definitions:

Definition of 'Fit rod'

From: GCIDE

Fit \Fit\, n.
1. The quality of being fit; adjustment; adaptedness; as of dress to the person of the wearer. [1913 Webster]
2. (Mach.) (a) The coincidence of parts that come in contact. (b) The part of an object upon which anything fits tightly. [1913 Webster]
Fit rod (Shipbuilding), a gauge rod used to try the depth of a bolt hole in order to determine the length of the bolt required. --Knight. [1913 Webster]