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==Etymology and derivation==
==Etymology and derivation==
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The Sanskrit term Rasayana is a combination of two terms. Rasa means the best or finest part or constituent fluid or essential juice of body.<ref>Monier-Williams, Monier-Williams Sanskrit- English Dictionary, 1st edition; Oxford University Press, Rasa, Page 869</ref> Ayana means going, circulating etc.<ref>Monier-Williams, Monier-Williams Sanskrit- English Dictionary, 1st edition; Oxford University Press, Ayana, Page 84</ref> Thus, Rasayana means the best constituent fluid circulating in the body.
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The Sanskrit term Rasayana is a combination of two terms. Rasa means the best or finest part or constituent fluid or essential juice of body.<ref>Monier-Williams, Monier-Williams Sanskrit- English Dictionary, 1st edition; Oxford University Press, Rasa, Page 869</ref> It is also the product formed after primary metabolism of food.
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Ayana means going, circulating etc.<ref>Monier-Williams, Monier-Williams Sanskrit- English Dictionary, 1st edition; Oxford University Press, Ayana, Page 84</ref> Ayana refers to circulation with constant upgradation of body constituents by extracting waste and produce the qualitatively best essence vital fluid called [[Ojas]]. Thus, Rasayana means the best constituent fluid circulating in the body.
==Definition==
==Definition==