samyamat constraint, control
tad from that form
grahya to be seized, taken, received, perceivable
lakti power, capacity, emanation
asamprayoge there being no contact
antardhanam disappearance, invisibility
By control over the subtle body, the yogi can suspend at will the rays of light radiating from himself, so that he becomes invisible to onlookers. He may again make himself visible by bringing back the power of perceptibility.