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
Webster's English Dictionary