1. able to be thrown overboard or discarded, especially in an emergency
Usage: nautical; aviation
2. able to be abandoned or given up when necessary

Examples

• The cargo was marked as jettisonable in case of emergency.
• All jettisonable equipment was removed to lighten the aircraft.
• The ship’s manifest listed which supplies were jettisonable.
• During the crisis, only jettisonable items were considered for removal.
• The pilot identified jettisonable fuel tanks to reduce weight.
• Emergency protocols specified which materials were jettisonable.