double-headed

Short definition from Wiktionary

Adjective

1. 1
   Having two heads.
2. 2
   Of a coin, having a head on both sides, especially when counterfeited by being constructed from two separate coins.
3. 3
   Of a train, hauled by two locomotives.
4. 4
   Synonym of sepmag (“having separately recorded picture and soundtrack”).

Verb

1. 1
   simple past and past participle of double-head