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Adjective: expendable  ik'spen-du-bul
  1. Not inexhaustible; not reusable, designed for a single use
    "The spacecraft's expendable fuel tanks were jettisoned after launch"
     
  2. (used of funds) remaining after taxes
    "expendable income";
    - spendable
     
  3. Able to be deliberately sacrificed to achieve an objective
    "The pawn was expendable in order to protect the queen";
    - sacrificeable

See also: consumable, disposable, replaceable

Antonym: unexpendable

Encyclopedia: Expendable