double-prop
- n a propeller plane with an engine that drives two propellers in opposite directions (for stability)
double-propeller plane
- n a propeller plane with an engine that drives two propellers in opposite directions (for stability)
double-reed instrument
- n a woodwind that has a pair of joined reeds that vibrate together
double-spacing
- n typing that leaves alternate lines blank
- v type with a full space between lines