Webster's English Dictionary

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lattice

lat.tice \'lat-*s\ \-*st\ n [ME latis, fr. MF lattis] often attrib  1a: a 
   framework or structure of crossed wood or metal strips  1b: a window, door, 
   or gate having a lattice  obs  1c: a lattice used as the sign of an 
   alehouse  2: a regular geometrical arrangement of points or objects over an 
   area or i n space : as 2a: SPACE LATTICE  2b: a geometrical arrangement of 
   fissionable material in a nuclear reactor  2c: a mathematical set that has 
   some elements ordered and that is such that  for any two elements there 
   exists a least element greater than both and a greatest element less than 
   both - lattice vt