center pin

center pin

noun Railroads.
a cylindrical device passing through the center plates of both the body bolster and the truck bolster, permitting the truck to swivel beneath the car body while the stress is taken by the center plate.

Origin:
1795–1805
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Center pin is always a great word to know.
So is bezoar. Does it mean:
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
a chattering or flighty, light-headed person.
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