The term cabochon comes from a French word that means head. Cabochon is often abbreviated as cab. A cabochon is a gemstone that has been cut into a shape then polished. Opaque stones are usually made into cabochons while transparent stones are faceted.
Asteriated stones are gems that have a star reflection, such as a star sapphire. The star would not be visible in a faceted cut, but is shown off brilliantly in a cabochon.