rotor cloud
noun
a cloud within and around which the air is rotating about a horizontal axis, occurring in the lee of a large mountain barrier.
Also called
roll cloud.
Origin of rotor cloud
First recorded in 1955–60
Words nearby rotor cloud
roto,
rotogravure,
roton,
rotor,
rotor blade,
rotor cloud,
rotorcraft,
rotorua,
rotoscoliosis,
rotoscope,
rototill