Flatiron (noun)

1. A small household appliance used for ironing clothes that is shaped like a triangle with a flat base and handle.
2. A triangular building with a flat front and back and sides that taper to a point, often used for offices or apartments.
3. A common term used for a wedge-shaped, triangular iron used in blacksmithing.

Origin:

The word 'flatiron' originated in the late 19th century and refers to the triangular shape of the original flat irons used for pressing clothes, which resemble a triangular building known as a 'flatiron building'.

Examples:

1. She used the flatiron to press the wrinkles out of her dress before the wedding.
2. The flatiron building was a landmark in the city and was known for its unique shape.
3. The blacksmith heated the flatiron in the forge before using it to shape the horseshoe.
4. The flatiron building was one of the first skyscrapers in the city, towering over the nearby buildings.
5. She carefully ironed each shirt with the flatiron, making sure to get all the wrinkles out.