An object that's been divided into thin pieces is sliced.
When we talk about slicing food, like when you order a sandwich and ask for it to be "sliced thinly," it means the cook takes a big piece of meat or bread and cuts it up into smaller, flat strips. This way, it's easier to eat and looks nice too. You can also think of sliced cheese, which is pre-cut into thin pieces so you don't have to do it yourself. If something is sliced up, like a cake for a party, it means the baker cut it into many small portions before serving.
How common is "sliced"?
Word sliced is considered uncommon in modern English. It appears most frequently in magazine texts and less often in other writings.
Definitions
verb
To cut into slices.
Example: Slice the cheese thinly.
To cut with an edge utilizing a drawing motion.
Example: The knife left sliced his arm.
To clear (e.g. a fire, or the grate bars of a furnace) by means of a slice bar.
To hit the shuttlecock with the racket at an angle, causing it to move sideways and downwards.
To hit a shot that slices (travels from left to right for a right-handed player).
To angle the blade so that it goes too deeply into the water when starting to take a stroke.
To kick the ball so that it goes in an unintended direction, at too great an angle or too high.
To hit the ball with a stroke that causes a spin, resulting in the ball swerving or staying low after a bounce.