The Collaborative International Dictionary of English v.0.48:

Lattice \Lat"tice\, n. [OE. latis, F. lattis lathwork, fr. latte
   lath. See Latten, 1st Lath.]
   1. Any work of wood, metal, plastic, or other solid material,
      made by crossing a series of parallel laths, or thin
      strips, with another series at a diagonal angle, and
      forming a network with openings between the strips; as,
      the lattice of a window; -- called also latticework.
      [1913 Webster]

            The mother of Sisera looked out at a window, and
            cried through the lattice.            --Judg. v. 28.
      [1913 Webster]

   2. (Her.) The representation of a piece of latticework used
      as a bearing, the bands being vertical and horizontal.
      [1913 Webster]

   3. (Crystallography) The arrangement of atoms or molecules in
      a crystal, represented as a repeating arrangement of
      points in space, each point representing the location of
      an atom or molecule; called also crystal lattice and
      space lattice.
      [PJC]

   Lattice bridge, a bridge supported by lattice girders, or
      latticework trusses.

   Lattice girder (Arch.), a girder of which the wed consists
      of diagonal pieces crossing each other in the manner of
      latticework.

   Lattice plant (Bot.), an aquatic plant of Madagascar
      (Ouvirandra fenestralis), whose leaves have interstices
      between their ribs and cross veins, so as to resemble
      latticework. A second species is Ouvirandra Berneriana.
      The genus is merged in Aponogeton by recent authors.
      [1913 Webster]

WordNet (r) 3.0 (2006):

space lattice
    n 1: a 3-dimensional geometric arrangement of the atoms or
         molecules or ions composing a crystal [syn: space
         lattice, crystal lattice, Bravais lattice]