retractor

noun

1. 1.One who, or that which, retracts.
2. 2.In breech-loading firearms, a device for withdrawing a cartridge shell from the barrel.
3. 3.A chess puzzle in which a number of moves are retracted and the solver is challenged to reach an alternate outcome.
4. 4.A surgical instrument used to hold apart the edges of an incision or wound.
5. 5.A bandage to protect soft parts of the body from injury by a surgical saw.