ˈbraˌvā-; brəˈvā-, braˈ- noun
Usage: usually capitalized B
Etymology: after Auguste Bravais died 1863 French physicist
: one of the 14 possible arrays of points used especially in crystallography and repeated periodically in 3-dimensional space so that the arrangement of points about any one of the points is identical in every respect (as in dimension and orientation) to that about any other point of the array — compare space lattice