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== Etymology and derivation:==
<p style="text-align:justify;">The word udaka is derived from root “undi kledane”.[4] It implies that thing which is to wet is udaka.
The word srotas is derived from Sanskrit root “sru”.[4] Meaing of sru is to secrete, to flow. Acharya sushruta defines srotas as tubular structures through which fluid material circulates in the body.[5] [Su. Sa. Sharira Sthana 09/13] Dalhana mentioned two important characteristics of srotas: 1. Passage for fluid (abhivahanshila) and 2. Hollow space to flow (avakash).[5] [Dalhan on Su. Sa. ShariraSthana 09/13] Srotas, according to acharya Charak, is a structure through which anything is conveyed or flows. [Cha. Sa. Sutra Sthana 30/12] Udakavaha srotas are the channels for water regulation.
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