Source : Webster's Revised Unabridged Dictionary (1913)

Suctorial \Suc*to"ri*al\, a. [L. sugere, suctum, to suck.]
   1. (Zo["o]l.) Adapted for sucking; living by sucking; as, the
      humming birds are suctorial birds.

   2. (Zo["o]l.) Capable of adhering by suction; as, the
      suctorial fishes.

Source : WordNet®

suctorial
     adj : adapted for sucking or clinging by suction