1. an Eskimo house, being a dome-shaped hut usually built of blocks of hard snow.
2. Informal. any dome-shaped construction thought to resemble an igloo: immense silos topped with steel igloos.
3. Military. a dome-shaped building for the storage of rockets or other munitions.
4. an excavation made by a seal in the snow over its breathing hole in the ice.
"tents can be igloo."
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