separator

noun3

1. •
   An object located between two or more things and hence separating them.

   • When applying polish, always use toe separators to keep toes apart. — 1998
2. •
   A device for removing one substance from another, such as cream from milk.
3. •
   One who separates; an agent performing the action of separating.

   • Death, the mystery, the great separator of friend from friend and loved one from loved one — 1979