Definition of "defroster" [defroster]

• A heating device designed to remove frost or prevent its formation. (noun)
• A device designed to thaw frozen goods. (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.

• "I have a newly re-engined 1978 Mustang that is about as basic as you can get; it has a rear-window defroster, which is constantly failing and twice shorted out and shattered the window."
• "He fumbled on the dashboard to find a defroster but found nothing."
• "Outside the Cherokee, Joe Lee pauses to salute Kenny through the defroster lines of the hatchback."