Webster's English Dictionary

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diameter

di.am.e.ter \di--'am-*t-*r\ \-'am-*-tr*l\ n [ME diametre, fr. MF, fr. L 
   diametros, fr. Gk, fr. dia- + ]metron measure 1: a chord passing through 
   the center of a figure or body  2: the length of a straight line through 
   the center of an object  - di.am.e.tral aj