Spline
Pronunciation : Spline
Part of Speech : n.
Definition : 1. A rectangular piece fitting grooves like key seats in a hub and a shaft, so that while the one may slide endwise on the other, both must revolve together; a feather; also, sometimes, a groove to receive such a rectangular piece.
2. A long, flexble piece of wood sometimes used as a ruler.
Source : Webster's Unabridged Dictionary, 1913