From Online Dictionary of Crystallography

Superréseau (Fr); Superreticolo (It); 超格子 (Ja).

A lattice L' obtained by another lattice L by adding one or more sets of nodes is called a superlattice of L. The translation subgroup T' of L' is a supergroup of the translation subgroup T of L. The unit cell of L' is smaller than the unit cell of L and is therefore called a subcell.

See also