Webster's English Dictionary

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pyramid

Cross references:
  1. volume                
 
1. pyr.a.mid \'pir-*-.mid\ \p*-'ram-*d-*l, .pir-*-'mid-*l\ \-*l-e-\ 
   \.pir-*-'mid-i-k*l\ n [L pyramid-, pyramis, fr. Gk, of unknown origin] 1a: 
   an ancient massive structure found esp. in Egypt having typically a squ are 
   ground plan, outside walls in the form of four triangles that meet in a 
   point at the top, and inner sepulchral chambers 1b: a structure or object 
   of similar form  2: a polyhedron having for its base a polygon and for 
   faces triangles with  a common vertex 3: a crystalline form each face of 
   which intersects the vertical axis and e ither two lateral axes or in the 
   tetragonal system one lateral axis 4: an immaterial structure built on a 
   broad supporting base and narrowing g radually to an apex {socioeconomic ~} 
   - py.ra.mi.dal aj
2. pyramid vi 1: to enlarge one's holdings on an exchange on a continued 
   rise by using p aper profits as margin to buy additional amounts 2: to 
   increase rapidly and progressively step by step on a broad base  1: to 
   arrange or build up as if on the base of a pyramid  2: to use or to deal in