"rapid stream," c. 1600, from French torrent (16c.) and directly from Latin torrentem (nominative torrens) "rushing, roaring" (of streams), also "a rushing stream," originally as an adjective "roaring, boiling, burning, parching, hot, inflamed," present participle of torrere "to parch" (from PIE root *ters- "to dry"). Extension to any onrush (of words, feelings, etc.) first recorded 1640s.
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Harper, D. (n.d.). Etymology of BitTorrent. Online Etymology Dictionary. Retrieved $(datetime), from https://www.etymonline.com/word/BitTorrent