An article of bedding with a
cord which is
plugged into an electrical
outlet. It usually has a dial which can be adjusted to provide varying degrees of
warmth.
I thought electric blankets were oddities until I went to college, where my roommate had one. Our dormitory room was frigid in the winters, and I learned that an electric blanket warms up your bed nicely before you lie down to sleep. Also wonderful if you have cold feet.