The Collaborative International Dictionary of English v.0.48:
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. [1913 Webster]WordNet (r) 3.0 (2006):
icebound adj 1: locked in by ice; "icebound harbors"