Webster's English Dictionary

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terrain

ter.rain \t*-'ra-n, te-\ n [F, land ground, fr. L terrenum, fr. neut. of 
   terrenus of earth -] more at TERRENE 1a1: a geographical area : REGION  
   1a2: a piece of earth : GROUND  1b: the physical features of a tract of 
   land : TOPOGRAPHY  2: TERRANE  3: ENVIRONMENT, MILIEU