The Collaborative International Dictionary of English v.0.48:

Allision \Al*li"sion\, n. [L. allisio, fr. allidere, to strike
   or dash against; ad + laedere to dash against.]
   The act of dashing against, or striking upon.
   [1913 Webster]

         The boisterous allision of the sea.      --Woodward.
   [1913 Webster]