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headblock

noun

Definition of headblock

: a block supporting the head of something: such as
a : a part of a sawmill carriage that supports the log
b : a block of wood between the fifth wheel and the forward spring of a carriage or wagon
c : one of a set of extra-long railroad ties used for supporting the operating mechanism of a point rail

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First Known Use of headblock

1811, in the meaning defined above

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The first known use of headblock was in 1811

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