Rasa (रसः)

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“Rasa” is one among the five qualities of dravya (substance). The term “rasa” means taste or the perception of taste. Also the guna (quality) of the rasendriya is known as rasa (the rasa dhatu among the saptdhatus is distinct from this rasa) Rasa in dravya(substance) are known by their effects in our body.

Etymology

रस्यत आस्वाद्यत इति रसः | (Char. Samh. 1.64)

Meaning: Rasa means which can be perceived by the tongue or that which can be tasted.

In a nutshell,

Rasa	Mahabhuta
Madhura	Prithvi, jala(earth+water)
Amla	Prithvi, tejas(earth+fire)
Lavana	Jala, tejas(water+fire)
Katu	Vayu, tejas(air+fire)
Tikta	Vayu, akasha(air+ether)
Kashaya	Vayu, prithvi(air+earth)