Auto shut off: A feature that shuts off the iron when it has been inactive for a preset amount of time. Basically it turns off the iron when you have forgotten to turn it off.
Boiler: A tank where water is heated and passed through to the iron to be used as steam. A storage tank for hot water.
Drip-stop: This is a feature that stops water from dripping onto the article of clothing when steam is in use.
Easy fill: Irons can be difficult to refill, most irons these days have a larger water inlet to increase your chance of actually getting the water into the tank rather than around it.
Self-clean: Some irons have the feature of self-cleaning where a burst of steam is ejected through the soleplate to clear the holes.
Soleplate: This is the metal plate at the bottom of the iron that is heated to make it possible for you to iron your clothes. The underside of the iron.
Starch: A substance used to stiffen up a material while ironing and preventing it from getting wrinkled.
Steam shot: A powerful burst of steam emitted from the soleplate to blast wrinkles away.
Teflon coating: A non-stick coating that allows the iron to glide more smoothly over clothing.
Water reservoir/tank: The part of the iron that holds the water. An iron has a water tank to make steam or to be used as a spray.
Wattage: The maximum power an iron is capable of, in other words how fast it can heat up and maintain a constant temperature.