Source : Webster's Revised Unabridged Dictionary (1913)

Icebound \Ice"bound`\, a.
   Totally surrounded with ice, so as to be incapable of
   advancing; as, an icebound vessel; also, surrounded by or
   fringed with ice so as to hinder easy access; as, an icebound
   coast.

Source : WordNet®

icebound
     adj : locked in by ice; "icebound harbors"