Webster's English Dictionary

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turnpike

turn.pike \'t*rn-.pi-k\ n [ME turnepike revolving frame bearing spikes and 
   serving as a barrier, fr]. turnen to turn + pike 1: a toll bar : TOLLGATE  
   2a: a toll road or one formerly maintained as such; esp : a toll ex 
   pressway 2b: a main road; esp : a paved highway with crowned surface