"Ice cube" is the Engpsh word for "冰块". It comes from the noun "ice", meaning frozen water, and the noun "cube", meaning a sopd block with six square faces. Here are some example sentences and their translations:
Can you bring me a few ice cubes for my drink?
能给我的饮料加几个冰块吗？
The bartender dropped an ice cube into the glass.
调酒师往杯子里放了一个冰块。
She filled the ice cube tray with water and put it in the freezer.
她用水填满冰块盘，把它放进冰箱。