The Collaborative International Dictionary of English v.0.48:

Hail \Hail\, v. i. [imp. & p. p. Hailed (h[=a]ld); p. pr. &
   vb. n. Hailing.] [OE. hailen, AS. hagalian.]
   To pour down particles of ice, or frozen vapors.
   [1913 Webster]