Merriam-Webster Collegiate Dictionary - lattice

 noun  Etymology: Middle English latis, from Anglo-French latiz  Date: 14th century  1.  a. a framework or structure of crossed wood or metal strips  b. a window, door, or gate having a ~  c. a network or design resembling a ~  2. a regular geometrical arrangement of points or objects over an area or in space; specifically the arrangement of atoms in a crystal  3. a mathematical set that has some elements ordered and that is such that for any two elements there exists a greatest element in the subset of all elements less than or equal to both and a least element in the subset of all elements greater than or equal to both  • ~ transitive verb  • ~d adjective