hollow block

Etymology
See, due to the hollow centers or cores that may be built into the production of these blocks to reduce weight.

Noun

 * 1)  A lightweight building block made from cinders and concrete.

Translations

 * Dutch:, snelbouwsteen
 * Finnish: rakennusharkko,
 * French:, ,
 * German: Schalstein
 * Korean: 콘크리트 블록
 * Polish: pustak betonowy
 * Portuguese: bloco de concreto
 * Romanian: bloc de beton (zguros, cu zgură), cărămidă de beton (ușoară, zguroasă)
 * Russian: шлакобето́нный блок,
 * Welsh: brisbloc