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==Etymology and derivation:==
==Etymology and derivation==
The word ‘rasa’ is derived from the Sanskrit root “ras” having the meaning of taste, to relish, to perceive, to feel, to desire.<ref> Monier Williams (1899), “रस्”, in A Sanskrit–English Dictionary, new edition, Oxford: At the Clarendon Press, OCLC 458052227, page 0869 </ref>
The word ‘rasa’ is derived from the Sanskrit root “ras” having the meaning of taste, to relish, to perceive, to feel, to desire.<ref> Monier Williams (1899), “रस्”, in A Sanskrit–English Dictionary, new edition, Oxford: At the Clarendon Press, OCLC 458052227, page 0869 </ref>
Rasa is derived from the root ‘gatau’ which means moving. As the nutrient fluid is continuously circulated in our body, it is known as rasa.[Su. Sa. Sutra Sthana 14/13]
Rasa is derived from the root ‘gatau’ which means moving. As the nutrient fluid is continuously circulated in our body, it is known as rasa.[Su. Sa. Sutra Sthana 14/13]
==Synonyms: ==
==Synonyms ==
• Adyadhatu(first [[dhatu]]) [A.Hr.Sutra Sthana 13/25]
• Adyadhatu(first [[dhatu]]) [A.Hr.Sutra Sthana 13/25]
• Prasada and Sara are the synonyms of rasa in the context of ahara rasa.
• Prasada and Sara are the synonyms of rasa in the context of ahara rasa.
==Meanings in different contexts: ==
== Meanings in different contexts ==
The word rasa has a wide range of meanings like taste, extract/juice, meat soup, mercury.
The word rasa has a wide range of meanings like taste, extract/juice, meat soup, mercury.
The rasa dhatu has [[jala mahabhuta]] predominance in its constitution. It possesses liquidity(drava), fluidity (sara), opaque(manda), viscous(snigdha) and unctuous(pichchila) properties.<ref name=Dwarakanath>Dwarkanath C. Introduction to Kayachikitsa. Chaukhambha Orientalia. Varanasi; 1996. Third edition.pg.320</ref>
The rasa dhatu has [[jala mahabhuta]] predominance in its constitution. It possesses liquidity(drava), fluidity (sara), opaque(manda), viscous(snigdha) and unctuous(pichchila) properties.<ref name=Dwarakanath>Dwarkanath C. Introduction to Kayachikitsa. Chaukhambha Orientalia. Varanasi; 1996. Third edition.pg.320</ref>
== Physiological aspects==
== Physiological aspects ==
===Formation,circulation and metabolism of rasa dhatu===
=== Formation,circulation and metabolism of rasa dhatu ===
Rasa dhatu is formed from essence of food(ahara rasa). The ingested food is disintegrated into two parts: essence or useful part (prasada) and waste (kitta). The prasada is called as essence of food (ahara rasa). This essence is transformed into a nutrient fluid called ‘rasa dhatu’. [Cha. Sa. [[Sutra Sthana]] 28/4]. It is the ultrafine form of ahara rasa. [Su. Sa. Sutra Sthana 14/3]
Rasa dhatu is formed from essence of food(ahara rasa). The ingested food is disintegrated into two parts: essence or useful part (prasada) and waste (kitta). The prasada is called as essence of food (ahara rasa). This essence is transformed into a nutrient fluid called ‘rasa dhatu’. [Cha. Sa. [[Sutra Sthana]] 28/4]. It is the ultrafine form of ahara rasa. [Su. Sa. Sutra Sthana 14/3]