cerradura
lock
cerrar
to close
+
-dura
noun suffix (result of an action)
Cerradura means lock and can be thought of as the result (-dura1) of closing0 (cerrar0) something.
noun
- lockA device for securing a door or container, typically operated by a keyLa cerradura de la puerta principal está rota. // The lock on the front door is broken.