ˌ ̷ ̷ ̷ ̷ˈ ̷ ̷ ̷ ̷ noun
Etymology: double deck (from double (I) + deck ) + -er
1. : a ship with two decks above the waterline
2. : a conveyance with one level over another level for additional passengers, stock, or freight (as a railway car, bus, or airplane)
3. : a house or building (as a 2-family tenement) having two stories
4. : biplane
5. : something having two horizontal layers like decks: as
a. : a large machine having upper and lower operating platforms (as a printing press)
b. : two single beds one above the other
c. : sandwich made of three layers of bread and two of filling
d. : an outdoor advertising stand with one billboard built on top of another
6. : a long novel in two volumes