(crystallography) The intergrowth of two twin crystals.

(of an aircraft) powered by two engines, one in each wing

Being the size of a twin bed.

Either of a pair of matching single beds. / (US) A single bed.

(rare, slang, offensive) Either of a pair of siblings born less than 12 months apart, especially if born within the same calendar year or school year or born one year apart.

(idiomatic) A duplicate or counterpart that acts in a contrary, nefarious, or insidious manner.

The two main buildings of the World Trade Center, destroyed in terrorist attacks on 9/11, 2001.

An inhabitant of the Twin Cities.

plural of Twin Citizen

The metropolitan area of Minneapolis and Saint Paul, Minnesota.