Webster's English Dictionary

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trapezium

tra.pe.zi.um \tr*-'pe--ze--*m\ \-ze--*\ n or tra.pe.zi.ums or tra.pe.zia 
   [NL, fr. Gk trapezion, lit., small table, dim. of trapeza table, fr] pl . 
   tra- four (akin to tettares four) + peza foot; akin to Gk pod-, pous foot - 
   more at FOUR, FOOT 1a: a quadrilateral having no two sides parallel  Brit  
   1b: TRAPEZOID  2: a bone in the wrist at the base of the thumb