A nail or fastener designed to hold or secure something in a specific shape or form during construction or assembly.
From form + nail (Old English nægl, 'spike'). This technical term combines two concrete objects: a nail serves a formative purpose in construction.
Formnail is a rare carpentry term that hints at how specific trades develop hyper-precise vocabulary—a regular person might say 'a nail for holding things in shape,' but craftspeople compress that into one economical word.
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