Source : Webster's Revised Unabridged Dictionary (1913)

Torrential \Tor*ren"tial\, Torrentine \Tor*ren"tine\, a.
   Of or pertaining to a torrent; having the character of a
   torrent; caused by a torrent . [R.]

Source : WordNet®

torrential
     adj 1: relating to or resulting from the action of a torrent;
            "torrential erosion"; "torrential adaptations seen in
            some aquatic forms"
     2: resembling a torrent in force and abundance; "torrential
        applause"; "torrential abuse"; "the torrential facility
        and fecundity characteristic of his style"- Winthrop
        Sargeant
     3: pouring in abundance; "torrential rains"