lattice lattice /ˈlætəs/

noun

1. Framework consisting of an ornamental design made of strips of wood or metal  ( fretwork , lattice , latticework )
   framework consisting of an ornamental design made of strips of wood or metal
   
   
2. Small opening (like a window in a door) through which business can be transacted  ( lattice , wicket , grille )
   small opening (like a window in a door) through which business can be transacted
   
3. An arrangement of points or particles or objects in a regular periodic pattern in 2 or 3 dimensions  ( lattice )
   an arrangement of points or particles or objects in a regular periodic pattern in 2 or 3 dimensions