The phrase "rear defogger" refers to a feature in a car that helps clear fog or frost from the back window, improving visibility for the driver. Full definition
WINDOW, POWER, REAR SLIDING WITH REAR DEFOGGER, WHEELS, 20» X 9» (50.8 CM X 22.9 CM) ULTRA BRIGHT MACHINED ALUMINUM, UNIVERSAL HOME REMOTE. (antiochtoyota.com)
Security anti-theft alarm system windows rear defogger power windows windows front wipers intermittent audio - radio amfm audio in - dash cd single disc audio... (car.mitula.us)
Each variant gets immobilizer and rear door child lock, whereas equipment such as rear defogger, rear fog lamps, rear smart wiper with washer and perimetric alarm system are exclusive to the high end variant. (auto.ndtv.com)