arch head
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noun Machinery.
a vertical, arc-shaped member fixed to the end of a walking beam, for supporting a chain from which a pump rod or the like is suspended in such a way as to let it rise and fall vertically.
Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for arch head
Historical Examples of arch head
It is divided into four lights, and the arch-head is filled with good simple tracery.
Scottish Cathedrals and AbbeysDugald Butler and Herbert Story