birotor
nounEtymology From bi- + rotor. Late 19th to early 20th century, originally with reference to pumps.
1
A pump or rotorcraft with two rotors or two main rotors.
birotor
adjEtymology From bi- + rotor. Late 19th to early 20th century, originally with reference to pumps.
1
Engineering, Natural sciences, Physical sciences, Technology Of pumps Having two rotors; having two main rotors.
Helicopters; or drones; helicopters; or drones