Definition of "life jacket" []

• A life preserver in the form of a sleeveless jacket or vest. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "He staggered up and stripped his E-suit down to the waist, sat down and cooled off for a moment, then slipped on the orange windbreaker and life jacket passed to him by the crewman."
• "Survivors struggled to climb over the gunwales; as many as five men clung to a single life jacket and a dozen to a single plank."