Definitions for ice shelf
Random House Webster's College Dictionary
an ice sheet projecting into coastal waters so that the end floats.
Origin of ice shelf:
shelf ice, ice shelf(noun)
ice that is attached to land but projects out to sea
A thick, floating platform of ice that forms where a glacier or ice sheet flows down to a coastline and onto the ocean surface. Ice shelves are found in Antarctica, Greenland, and Canada only.