Webster's English Dictionary

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frustum

frus.tum \'fr*s-t*m\ \-t*\ n or frustums or frus.ta [NL, fr. L, piece, bit 
   - more at BRUISE] pl  : the part of a cone-shaped solid next to the base 
   and formed by cutting o ff the top by a plane parallel to the base; also : 
   the part of a solid intersected between two usu. parallel planes