torrential

from WordNet (r) 3.0 (2006)

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"

from The Collaborative International Dictionary of English v.0.48

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.]
   [1913 Webster]