(Sanskrit) One of the eight major powers (siddhis).
"The power to willingly increase the weight of the physical body to that of a mountain." - The Aquarian Message
"This is the opposite of Laghima. In this the Yogi acquires an increase of specific gravity. He can make the body as heavy as a mountain by swallowing draughts of air." - Swami Sivananda, Kundalini Yoga