noun
also cy·clo·gy·ro | ̷ ̷ ̷ ̷ at cyclo- +|jī(ˌ)rō
( -s )
Etymology: cycl- + giro, gyro
: a rotary-wing aircraft whose support in the air is normally derived from airfoils arranged like the paddles of a paddle wheel, mechanically rotated about horizontal axes perpendicular to the plane of symmetry of the aircraft, and having an angle of attack that is always less than the stalling angle