even if the word nadi was adopted by a later medical science of India as being the most suitable expression for nerves and blood-vessels, this does not justify the substitution of these physiological concepts for the original meaning of the yoga-term
Govinda establishes the foundational hermeneutic claim that nadi, despite medical appropriation, retains a distinct yogic meaning as a channel of psychic force not reducible to nervous or vascular anatomy.
, Foundations of Tibetan Mysticism, 1960thesis