Nadi

(“tube”) In general, the word nadi may
be applied to any pipe or tube,
whether in plumbing or the human
circulatory system. A nadi has a more
specialized meaning with regard to
the Hindu conception of the subtle
body. The subtle body is an alternate
physiological system, existing on a
different plane than gross matter, but
corresponding to the material body. It
consists of six psychic centers
(chakras), visualized as multipetaled
lotus flowers running roughly along
the spine, connected by three vertical
channels known as nadis. Of these,
the ida nadi is on the left side, the
pingala nadi on the right, and the
sushumna in the center.