GNU Collaborative International Dictionary of English

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Found one definition

1.       
   Spline (?), n.
   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.
   
   [1913 Webster]
   
   
   2. A long, flexble piece of wood sometimes used as a ruler.
   
   [1913 Webster]