This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. An extensive dome-shaped or platelike perennial cover of ice and snow that spreads out from a center and covers a large area, especially of land.

n. A permanent expanse of ice encompassing a large geographical area, e.g. in Earth's polar zones.

n. a mass of ice and snow that permanently covers a large area of land (e.g., the polar regions or a mountain peak).

n. A general or continuous permanent covering of a certain area of land, whether large or small, with snow, névé, or ice, especially in the arctic regions.

n. In therapeutics, a rubber bag containing ice for application to the head.

n. a mass of ice and snow that permanently covers a large area of land (e.g., the polar regions or a mountain peak)

n. a mass of ice and snow that permanently covers a large area of land (e.g., the polar regions or a mountain peak)

"Thanks to global warming, the Arctic icecap is rapidly melting, opening up access to massive natural resources and creating shipping shortcuts that could save billions of dollars a year."

ice mass   

region    planto    fountainhead    motive power    star'