flatiron

Short definition from Wiktionary

Noun

1. 1
   A simple iron (for pressing laundry) which is heated on a stove.
2. 2
   A pair of metal tongs with heated ceramic plates used for straightening hair.
3. 3
   a quadrilateral with two parallel sides, one of which is very short, and whose non-parallel sides are longer than either parallel side.
4. 4
   A steeply sloping triangular landform created by the differential erosion of a steeply dipping, erosion-resistant layer of rock overlying softer strata.
5. 5
   Ellipsis of flat iron steak.

Adjective

1. 1
   Having a flatiron shape.

Proper noun

1. 1
   A district of Manhattan, New York City, United States.