Webster's English Dictionary

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thigh

thigh \'thi-\ n [ME, fr. OE the-oh; akin to OHG dioh thigh, L tume-re t]o 
   swell - more at THUMB 1a: the proximal segment of the vertebrate hind limb 
   extending from the hip  to the knee and supported by a single large bone 
   1b: the segment of the leg immediately distal to the thigh in a bird or in  
   a quadruped in which the true thigh is obscured 1c: the femur of an insect  
   2: something resembling or covering a thigh