• wave theory of cycles

चक्रवात:    cyclone whirlwind twister storm cyclonic

चक्रवात तरंग:    cyclone wave चक्रवात cyclone

तरंग:    caprice fancy freak roller water wave maggot

तरंग सिद्धांत:    wave theory undulatory theory theory of waves

सिद्धांत:    doctrine principle Maxim rule motto outlines